Mastercam+x72022+virtual+usb+bus+error+39+fixed

Mastercam X7-2022 “Virtual USB Bus Error 39”: The Definitive Fix Guide

Published by: CAD/CAM Troubleshooting Lab
Target Software: Mastercam X7, X8, X9, 2017, 2018, 2019, 2020, 2021, 2022
Error Code: Code 39 (Windows Device Manager – Virtual USB Bus Driver)

Phase 3: Reinstall the Correct Virtual Bus Driver

Do not rely on Mastercam’s default installer—it often bundles the broken driver.

  1. Download the Sentinel HASP/LDK driver from Thales (formerly SafeNet). Look for version 8.31 or higher.
  2. Run the haspdinst.exe -install command from an admin command prompt: 
    cd C:\Program Files (x86)\Common Files\Aladdin Shared\HASP
haspdinst.exe -remove
haspdinst.exe -install
  3. Download the standalone Virtual USB Bus driver (search for vusbbus.inf for Mastercam 2022).
  4. Right-click the .inf file → Install.

Solutions

  1. Update Drivers:

    • Go to Device Manager (Press Windows key + X and select Device Manager).
    • Locate the device with the issue (it might be under "Other devices" with a generic name, or it could be listed under "Universal Serial Bus Controllers" if it's a USB-related issue).
    • Right-click and select "Update driver".
    • Search automatically for updated driver software.

  2. Reinstall Drivers:

    • If updating doesn’t work, try uninstalling the driver, then restart your computer. Windows should reinstall the driver upon restart. If it’s a virtual device, you might need to reinstall the software that created it.

  3. Disable USB Selective Suspend:

    • Some users find success by disabling USB Selective Suspend. Go to Power Options > Change plan settings > Change advanced power settings > USB settings > USB selective suspend setting, and set it to Disabled.

  4. Software-specific Solutions:

    • Ensure Mastercam X7 2022 and any related software or plugins are up to date.
    • Check the Mastercam community forums or contact their support for specific guidance related to error 39.

  5. Virtual USB Bus Error Specifics:

    • If the error specifically mentions a virtual USB bus, ensure any virtual device software (e.g., virtual machine software) is properly configured and updated.

Summary of the problem

Epilogue: Lessons from the Edge

The fix lasted 14 months until a Windows security update rewrote the USB class driver again. By then, Marcus had finally migrated to Mastercam 2024, but he kept an air-gapped Windows 10 LTSC machine with the hacked driver—just in case.

Error 39 remains a cautionary tale: Virtual USB buses are fragile illusions. When the OS changes the rules of reality, even a perfectly good dongle becomes a ghost. And sometimes, to fix it, you have to become a ghost yourself—editing registries, forging signatures, and whispering to the kernel in its own dark language.

Final technical summary for those who just want the fix:

| Step | Action | |------|--------| | 1 | Disable Secure Boot (temporarily) | | 2 | Uninstall hidden "Virtual USB Bus (HASP)" device with driver deletion | | 3 | Block automatic reinstall via pnputil /disable-device | | 4 | Modify HASP INF to add LowerFilters key | | 5 | Self-sign INF and add to Trusted Publishers | | 6 | Registry: SkipDriverError39Check = 1 under the device instance | | 7 | Re-enable Secure Boot (if stable) |

Warning: This is a deep hack. It works for Mastercam X7 (and similar older HASP-protected software) on Windows 10 22H2 and early Windows 11 builds. Not for production environments without rigorous testing.

The Virtual USB Bus Error 39 in Mastercam (typically versions X7 through 2022) is a common driver signature or compatibility issue. It occurs because Windows cannot load the virtual device driver required for the software's emulator (often used for bypasses or specific hardware keys) because it isn't digitally signed or is being blocked by security features. Core Causes of Error 39

Driver Signature Enforcement: Windows 10 and 11 block drivers that aren't verified by Microsoft.

Memory Integrity (HVCI): A Windows Security feature that prevents "untrusted" drivers from loading into high-security memory.

Corrupt Registry Entries: Leftover keys from previous installations or failed emulator setups. Step-by-Step Solutions 1. Disable Windows Driver Signature Enforcement

This is the most common fix for Error 39. Windows requires a special boot mode to allow these virtual drivers to load. Click Start > Settings > Update & Security > Recovery. Under Advanced startup, click Restart now.

Once the PC restarts, navigate to: Troubleshoot > Advanced options > Startup Settings > Restart.

After restarting again, a list of options will appear. Press 7 or F7 to Disable driver signature enforcement.

Once Windows boots, try reinstalling the virtual USB driver or launching Mastercam. 2. Turn Off Memory Integrity (Core Isolation)

Modern Windows security often blocks virtual USB emulators even if signature enforcement is off. Open Windows Security (search for it in the Start menu). Go to Device security > Core isolation details. Toggle Memory integrity to Off. Restart your computer. 3. Update or Reinstall the MultiKey/Emulator Driver

If the driver itself is outdated, it will trigger Error 39 regardless of settings. Open Device Manager (Right-click Start > Device Manager).

Look for Universal Serial Bus controllers or System devices.

Locate the "Virtual USB Bus" or "MultiKey" entry with the yellow exclamation mark.

Right-click it, select Uninstall device, and check "Delete the driver software for this device."

Run your emulator setup script (usually install.bat or setup.exe provided with your specific version) as an Administrator. 4. Registry Cleanup

If the error persists, old registry keys might be pointing to the wrong driver path. Press Win + R, type regedit, and hit Enter.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MultiKey (or the specific emulator key). Ensure the paths match your current installation directory.

Note: Always back up your registry before making manual changes. Verification

After applying these fixes, check the Device Manager again. The "Virtual USB Bus" should appear under "System devices" or "USB controllers" without any warning icons.

The Mastercam Virtual USB Bus Error 39 is a common hardware driver issue that prevents the software's licensing dongle (HASP/HLK) from communicating with Windows. The error message typically states that the "driver may be corrupted or missing," but in modern systems, it is frequently caused by advanced security features blocking the emulator or driver. Core Causes of Error 39

Memory Integrity (Core Isolation): This is the most frequent culprit on Windows 10 and 11. This security feature prevents unsigned or legacy drivers from loading into high-security memory zones.

Corrupted Registry Entries: Leftover "UpperFilters" or "LowerFilters" in the Windows Registry can cause universal serial bus (USB) controllers to fail.

Outdated Drivers: Using legacy drivers for Mastercam versions like X7 on modern operating systems often leads to compatibility conflicts. Proven Fixes for Mastercam X7–2022 1. Disable Core Isolation (Recommended) mastercam+x72022+virtual+usb+bus+error+39+fixed

If you are using a virtual USB bus or an older dongle, Windows Security may be blocking it. Open Windows Security and navigate to Device Security.

Select Core isolation details and toggle Memory integrity to Off.

Restart your computer and check the Device Manager to see if the error has cleared. 2. Registry Correction (Advanced)

If disabling Core Isolation doesn't work, you may need to clear corrupted filters in the Registry.

Open regedit and navigate to the class GUID for USB controllers:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36fc9e60-c465-11cf-8056-444553540000

Locate and delete the UpperFilters or LowerFilters values in the right-hand pane. Restart the system. 3. Clean Driver Reinstallation

A standard reinstall often fails because it leaves behind corrupted files.

Go to Device Manager, right-click the item with the yellow exclamation mark (usually under "Universal Serial Bus controllers"), and select Uninstall device.

Download the latest Sentinel HASP/LDK drivers directly from the Thales Customer Support Portal or the official Mastercam downloads page to ensure compatibility with Windows 10/11. 4. User Profile Corruption

In some enterprise environments, the error may stem from a corrupt Windows User profile. Users have found that deleting and recreating the local Windows profile can resolve persistent Mastercam launch failures that hardware fixes could not address. Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

The "Code 39" error for the Mastercam Virtual USB Bus (often associated with

emulators) typically occurs because newer Windows security features block older, unsigned drivers. Primary Fix: Disable Memory Integrity In Windows 10 and 11, the Core Isolation

feature prevents drivers from loading if they do not meet specific security requirements, resulting in a Code 39 error. Matsusada Precision Start menu and search for "Windows Security" Navigate to Device Security Core isolation details Memory integrity Restart your computer for the changes to take effect. Alternative Fix: Clear Registry Filters

If disabling Core Isolation doesn't work, corrupted registry values may be blocking the virtual bus. , and run it as an administrator. Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\ Locate the key: 36FC9E60-C465-11CF-8056-444553540000 (this is the USB Class key). In the right pane, look for UpperFilters LowerFilters . Right-click and Restart your PC Advanced Troubleshooting Driver Reinstallation Device Manager

, find the Virtual USB Bus with the yellow exclamation mark, right-click, and select Uninstall device

. Restart your PC to let Windows attempt a clean re-detection. User Profile Corruption : Some Mastercam users report that a corrupted Windows User profile

can cause persistent virtual USB errors; creating a new local user account may resolve the issue. Driver Signature Enforcement : For older versions like X7, you may need to permanently disable driver signature enforcement

via the advanced startup menu to allow the virtual driver to load. Google Groups If you'd like, I can help you: exact registry path for your specific Mastercam version. Guide you through disabling Driver Signature Enforcement Troubleshoot Sentinel/HASP driver conflicts. Let me know which Windows version you are currently running. How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial]

The "Code 39" error for the Mastercam Virtual USB Bus (often associated with MultiKey or HASP emulators) typically indicates that Windows cannot load the driver because it is either corrupted, missing, or blocked by security features. This issue is common in Windows 10 and 11 environments due to increased security around unsigned or third-party drivers. Primary Cause: Core Isolation (Memory Integrity)

The most frequent cause of Code 39 for virtual drivers in modern Windows is Core Isolation , specifically the Memory Integrity

setting. This feature prevents drivers that do not meet strict security standards from loading. Matsusada Precision How to Fix Windows Security from the Start menu. Navigate to Device Security Core isolation details Memory integrity Restart your computer to apply the changes. Matsusada Precision Alternative Solution: Registry Modification

If the error persists or you cannot access security settings, you can manually disable the integrity check via the Registry Editor. Registry Path

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity : Find the value and set it to Legacy Fix : Some users resolve Code 39 by deleting UpperFilters LowerFilters

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 if they exist. Driver Reinstallation Steps

How to Fix Mastercam Virtual USB Bus Error Code 39 (X7–2022) Encountering the Virtual USB Bus Error 39

in Mastercam (X7 through 2022 versions) can bring your production to a standstill. This error typically signifies that Windows cannot load the device driver because it is either corrupted or missing. Frequently, it is caused by modern Windows security features or registry conflicts.

Below is a comprehensive guide to resolving this error and getting your HASP back online. 1. Disable Core Isolation (Memory Integrity)

The most common cause of Error 39 on Windows 10 and 11 is a security feature called Core Isolation

. This feature often blocks older or virtual drivers from loading. Open Windows Security Privacy & Security (Windows 11) or Update & Security (Windows 10). Navigate to Device Security Windows Security Device Security Modify Core Isolation : Click on Core isolation details Turn Off Memory Integrity : Toggle the switch for Memory integrity Restart Your PC : You must reboot for these changes to take effect. 2. Delete Registry UpperFilters and LowerFilters

If the error persists, there may be corrupted registry entries in the USB controller class that prevent drivers from initializing. , and hit Enter to open the Registry Editor Navigate to the following path:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 In the right-side pane, look for UpperFilters LowerFilters Right-click and these values. Restart your computer to allow Windows to rebuild these filters. 3. Reinstall Virtual USB MultiKey Drivers

In some cases, the virtual bus driver itself needs a fresh installation or an updated file set to match modern Windows security standards. Remove Existing Drivers

: Go to your Mastercam installation or MultiKey folder and run the remove.cmd remove.bat file as an administrator. Update Driver Files : Some users find success by replacing older Mastercam X7-2022 “Virtual USB Bus Error 39”: The

files in the MultiKey folder with updated versions designed for Windows 10/11. install.cmd

file as an administrator. When the Windows Security prompt appears, select Install this driver software anyway 4. Advanced Troubleshooting Tips Change USB Ports

: Sometimes simply moving the physical HASP to a different USB port can trigger a driver refresh. Disable Hypervisor-Enforced Code Integrity : In the Registry Editor, navigate to

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity and set the Check Antivirus

: Ensure your antivirus software isn't quarantining critical Mastercam or HASP driver files.

For more specific driver downloads, always refer to official sources like the Sentinel/SafeNet Support Page or contact your Mastercam Reseller for verified driver packages. Are you using a physical HASP virtual emulator , and did you recently install any Windows Updates Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

In Mastercam (X7 through 2022 versions), Virtual USB Bus Error 39

is a common driver-related issue that prevents the software from verifying its hardware security key (HASP)

. This error typically indicates that Windows cannot load the device driver because it is either corrupted, missing, or blocked by modern security features. Core Causes Core Isolation (Memory Integrity):

This is the most frequent cause on Windows 10 and 11. This security feature blocks older drivers that don't meet modern memory safety standards. Corrupt Registry Entries:

Invalid "UpperFilters" or "LowerFilters" in the Windows Registry can prevent the USB bus from communicating with the driver. Driver Incompatibility:

Legacy Mastercam versions (like X7) use older Virtual USB MultiKey drivers that are often flagged as unsigned or incompatible by newer Windows updates. Step-by-Step Fixes 1. Disable Core Isolation (Most Effective)

Since many Mastercam drivers are older, disabling this Windows security feature often resolves the block immediately. Windows Security via the Start menu. Navigate to Device security Core isolation details Memory integrity your computer for changes to take effect. 2. Modify the Windows Registry

If disabling Core Isolation fails, you may need to clear corrupted filter entries. Back up your registry before proceeding. , and run as Administrator. Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\ Locate the USB class folder: 36FC9E60-C465-11CF-8056-444553540000 In the right pane, find UpperFilters , right-click it, and select 3. Reinstall Virtual USB MultiKey Drivers

For older Mastercam versions (X7–X9), the virtual bus itself may need a "clean" reinstallation. Device Manager

and find the "Virtual USB MultiKey" with the yellow exclamation mark. Right-click and select Uninstall device remove.bat

(or similar) file from your Mastercam installation folder to clear old driver fragments. install.bat

as an Administrator to reinstall the updated 64-bit drivers. Advanced Troubleshooting

If the steps above do not work, consider these alternative solutions reported by the community: Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups 24 Jul 2024 —

Introduction

Mastercam X7 2022 is a popular computer-aided manufacturing (CAM) software used for CNC machining. However, some users have reported encountering a "Virtual USB Bus Error 39" issue while trying to use the software. This error can be frustrating and prevent you from using the software effectively. In this guide, we will walk you through the steps to fix this error.

What is Virtual USB Bus Error 39?

The Virtual USB Bus Error 39 is a common error that occurs when the Mastercam X7 2022 software is unable to communicate with the USB dongle (also known as a hardware key or license key). The dongle is a small device that plugs into your computer's USB port and is used to authenticate the software license.

Causes of Virtual USB Bus Error 39

The error can be caused by a variety of factors, including:

  1. Faulty USB dongle: The dongle may be damaged or malfunctioning.
  2. USB port issues: The USB port may be faulty or not functioning correctly.
  3. Driver problems: Outdated or corrupted drivers may be preventing the software from communicating with the dongle.
  4. Conflicting software: Other software may be interfering with the Mastercam X7 2022 software.
  5. Windows registry issues: Registry entries may be corrupted or incorrect.

Step-by-Step Solution

To fix the Virtual USB Bus Error 39, follow these steps:

Step 1: Troubleshoot the USB Dongle

  1. Try using a different USB port on your computer.
  2. Check the dongle for physical damage.
  3. If possible, try using a different dongle.

Step 2: Update Drivers

  1. Go to the Device Manager (Windows key + X and select Device Manager).
  2. Expand the "Universal Serial Bus controllers" section.
  3. Right-click on each USB Root Hub and select "Update driver".
  4. Follow the prompts to search for and install updated drivers.

Step 3: Disable Conflicting Software

  1. Close all unnecessary programs and background applications.
  2. Check for any antivirus software that may be interfering with the Mastercam X7 2022 software.
  3. Temporarily disable any firewall or antivirus software.

Step 4: Clean the Windows Registry

  1. Open the Registry Editor (Windows key + R, type "regedit", and press Enter).
  2. Navigate to the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceClasses\a45c254e-df1c-4efd-8020-67d146a850e0\####\Device Parameters
  3. Look for any entries with a " USB" or "Virtual" keyword.
  4. Delete any entries that seem suspicious or unnecessary.

Step 5: Reinstall Mastercam X7 2022

  1. Uninstall the Mastercam X7 2022 software.
  2. Reinstall the software from the original installation media or download.

Step 6: Apply the Fix

  1. Download and install the Mastercam X7 2022 patch from the official CNC Software website.
  2. Follow the prompts to apply the patch.

Verification

After completing these steps, start Mastercam X7 2022 and verify that the Virtual USB Bus Error 39 is resolved. If you still encounter the error, you may want to contact CNC Software support or a qualified technical support specialist for further assistance.

Conclusion

Phase 4: Registry Fix for Code 39 (The Nuclear Option)

If the above fails, the driver’s upper/lower filters are corrupted.

Warning: Backup your registry first.

  1. Press Win + R, type regedit, press Enter.
  2. Navigate to: 
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000
  3. In the right pane, look for UpperFilters and LowerFilters.
  4. Delete both values (don’t panic—they regenerate).
  5. Close regedit and restart your PC.

After reboot, the system recreates clean filters. Reinstall the Virtual USB Bus driver from Phase 3.

Chapter 4: The Resurrection

The Precision rebooted. No yellow exclamation. The virtual USB bus showed as "running" in Device Manager. Marcus launched Mastercam X7.

The splash screen appeared. Then the license check. Then—the toolpath workspace.

Error 39 was dead.

Closing

Follow the ordered recovery sequence above; if the issue persists after reinstalling the correct vendor runtime and repairing system files, collect the requested logs and contact the dongle vendor or Mastercam support.

(Invoking related search suggestions now.)

This text appears to be a search query or a file name, likely related to software troubleshooting or piracy. It suggests a user is looking for a solution to a specific technical error within the Mastercam X7 2022 software.

Here is a breakdown of the components:

Context: The combination of these terms strongly suggests this is related to cracked software. Legitimate users experiencing a driver error would usually contact the software vendor (CNC Software) or reinstall the official dongle drivers (like the Sentinel Driver). The search for a "fixed" file usually implies bypassing the security check that is causing the virtual bus error.

Safety Warning: If you found a file with this name or are considering downloading a "fix" for this error:

  1. Malware Risk: Files claiming to fix DRM or dongle errors are a common vector for trojans and malware.
  2. Stability: Modifying system bus drivers to bypass security can cause system instability or affect other USB devices.
  3. Legality: Using software bypasses violates the software's End User License Agreement (EULA) and copyright laws.

The "Error Code 39" in Mastercam (typically related to the Virtual USB MultiKey or HASP drivers) usually indicates that Windows cannot load the device driver because it is either corrupted, missing, or blocked by security features. This is a common issue on Windows 10 and 11 due to enhanced security protocols like Memory Integrity. Core Solutions to Fix Error 39

The most effective fix for this specific Mastercam error involves adjusting Windows security settings or cleaning up registry filters. 1. Disable Core Isolation (Memory Integrity)

This is the most frequent cause for Virtual USB drivers failing to load. Windows security blocks drivers it deems "incompatible" with memory protection. Open the Start menu and search for Windows Security. Navigate to Device security > Core isolation details. Toggle Memory integrity to Off. Restart your PC for the changes to take effect. 2. Delete Upper/Lower Filters in Registry

If the driver itself is corrupted, Windows may have "stuck" filters in the registry preventing proper communication.

Press Win + R, type regedit, and hit Enter to open the Registry Editor.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36fc9e60-c465-11cf-8056-444553540000 (This is the standard class for USB controllers).

In the right pane, look for UpperFilters and LowerFilters. If they exist, right-click and Delete them. Restart your computer. 3. Reinstall Virtual USB / HASP Drivers How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial]

Fixes — concrete steps (ordered: safest → more intrusive)

Important: Back up system restore point and export registry keys you modify.

A. Restart and simple checks

  1. Reboot Windows and try a different USB port (preferably direct motherboard port).
  2. Try the dongle on another known-working machine to confirm dongle hardware.

B. Reinstall/repair license drivers (Vendor-specific)

Examples:

C. Remove corrupted drivers and reinstall

  1. In Device Manager, enable "Show hidden devices".
  2. Right-click the virtual USB device → Uninstall device. If offered, check "Delete the driver software for this device".
  3. Reboot.
  4. Install vendor runtime/driver as above.
  5. Plug dongle. Verify Device Manager shows the driver and no error.

D. Repair Windows driver store and system files

  1. Run elevated Command Prompt:
    • sfc /scannow
    • DISM /Online /Cleanup-Image /RestoreHealth
  2. Reboot and check device.

E. Check and clean registry filter drivers (UpperFilters/LowerFilters)

  1. Open regedit and navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ClassGUID where GUID corresponds to the device class (often USB or the vendor class). The exact class GUID depends on device; look at Device Manager → Details → Class GUID.
  2. If UpperFilters or LowerFilters entries reference the vendor filter driver that may be corrupt, export the key then delete the UpperFilters/LowerFilters values.
  3. Reboot. Reinstall driver if needed.

F. Reinstall Mastercam license components

G. Check services and permissions

  1. Ensure relevant license services are running (e.g., Sentinel HASP License Manager service).
  2. Set service to Automatic and start it.
  3. Verify service account permissions (Local System).

H. Antivirus/Driver signature enforcement

I. If driver files exist but get blocked by Windows driver store corruption Download the Sentinel HASP/LDK driver from Thales (formerly

  1. Use pnputil to remove driver package, then re-add:
    • pnputil /enum-drivers
    • pnputil /delete-driver <oem#.inf> /uninstall /force
    • Then reinstall proper driver package.

J. Reinstallation of Windows USB Controller drivers

  1. In Device Manager, uninstall USB Root Hubs and Host Controllers.
  2. Reboot to let Windows re-detect and install them.

K. Last resorts

  1. System Restore to point before error appeared.
  2. In-place Windows repair or repair install.
  3. Contact the dongle vendor or Mastercam support for vendor-specific diagnostic logs.