Mastercam X7-2022 Virtual Usb Bus Error 39 -

The Mastercam Virtual USB Bus Error (Code 39) is a driver-related issue that prevents the software from recognizing the necessary security dongle (HASP) or virtual licensing key. It most frequently occurs on Windows 10 and 11 due to modern security features blocking older or non-digitally signed virtual USB drivers. Root Causes

Core Isolation / Memory Integrity: This is the most common cause in Windows 10/11. The security feature blocks drivers that it deems incompatible or unverified.

Corrupted Registry Values: Missing or corrupted "UpperFilters" and "LowerFilters" in the Windows Registry can prevent the USB bus driver from loading.

Outdated/Incompatible Drivers: Older versions of the Mastercam/Aladdin HASP drivers often lack the digital signatures required by modern Windows security protocols.

Windows User Profile Corruption: In some instances, a crash while multiple Mastercam sessions are open can corrupt the user profile, causing persistent startup failures. Recommended Fixes Expected Result Disable Core Isolation

Navigate to Windows Security > Device Security > Core Isolation details and turn Memory Integrity to Off.

Allows Windows to load the "incompatible" virtual USB driver. Registry Cleanup

Use regedit to locate the Class key 36FC9E60-C465-11CF-8056-444553540000 and delete UpperFilters/LowerFilters. Clears conflicting filter drivers that block the USB bus. Update Drivers

Download the latest HASP/LDK drivers from the official Thales (formerly Aladdin) support site.

Replaces corrupted or unsigned files with verified versions. Recreate User Profile

Delete the affected Windows User Profile and log in with a fresh one.

Resolves application crashes linked to corrupted configuration files. Troubleshooting Checklist Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

Mastercam X7-2022 : Fixing the "Virtual USB Bus Error 39" If you are seeing Error Code 39 while attempting to run Mastercam X7 Mastercam 2022

, your Windows operating system is likely blocking the Virtual USB Bus driver. This error typically states that Windows cannot load the device driver because it may be corrupted or missing. In the context of Mastercam, this usually points to a conflict with modern Windows security features like Core Isolation. Top Solution: Disable Core Isolation (Memory Integrity)

The most common cause for Error 39 on Windows 10 and 11 is the Memory Integrity setting within Core Isolation. This feature can block older or virtual drivers—like the one Mastercam uses for its HASP/USB licensing—to prevent unauthorized access. To disable it: Open Windows Security via the Start menu. Navigate to Device Security on the left sidebar. Click on Core isolation details. Toggle the Memory integrity switch to Off. Restart your computer to apply the changes.

Alternative: Registry Fix for "UpperFilters" and "LowerFilters"

If disabling Memory Integrity doesn't work, corrupted registry values may be preventing the Virtual USB Bus from loading. Press Win + R, type regedit, and hit Enter. Mastercam X7-2022 Virtual Usb Bus Error 39

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\.

Locate the specific GUID for your USB device (look for one containing "Universal Serial Bus controllers"). On the right pane, look for UpperFilters and LowerFilters. Right-click and Delete these values. Restart your PC. Additional Troubleshooting Steps Mastercam USB HASP issue - eMastercam.com

Report: Mastercam X7-2022 Virtual USB Bus Error 39

Introduction

Mastercam X7-2022 is a popular computer-aided manufacturing (CAM) software used for machining and manufacturing processes. However, some users have reported encountering a Virtual USB Bus Error 39 when using the software. This report aims to provide an overview of the error, its possible causes, and potential solutions.

Error Description

The Virtual USB Bus Error 39 is a common error that occurs when the Mastercam X7-2022 software is unable to communicate with a virtual USB device. The error message typically appears as:

"Virtual USB Bus Error 39: The driver returned a failed result for a request to retrieve the device descriptor."

Possible Causes

After analyzing various user reports and forums, the following possible causes of the Virtual USB Bus Error 39 have been identified:

Outdated or Corrupt Device Drivers: Outdated or corrupt device drivers, particularly the virtual USB bus driver, can cause this error.
USB Port Issues: Issues with the USB port, such as a faulty or malfunctioning port, can prevent Mastercam X7-2022 from communicating with the virtual USB device.
Software Conflict: Conflicts with other software or plugins installed on the system can cause the error.
Registry Issues: Registry errors or corrupted registry entries can prevent Mastercam X7-2022 from functioning properly.

Solutions

To resolve the Virtual USB Bus Error 39, try the following solutions:

Update Device Drivers:
- Go to the Device Manager (Windows) and expand the "Universal Serial Bus controllers" section.
- Right-click on the virtual USB bus device and select "Update driver".
- Follow the prompts to search for and install any available updates.
Disable and Re-enable the Virtual USB Bus:
- Go to the Device Manager (Windows) and expand the "Universal Serial Bus controllers" section.
- Right-click on the virtual USB bus device and select "Disable device".
- Wait for 10 seconds and then enable the device again.
Check USB Port:
- Try using a different USB port on the system.
- Ensure that the USB port is not damaged or malfunctioning.
Uninstall and Reinstall Mastercam X7-2022:
- Uninstall Mastercam X7-2022 and then reinstall it.
- Ensure that all registry entries are removed during the uninstallation process.
Run the Registry Repair Tool:
- Run a registry repair tool, such as CCleaner, to scan and repair any registry errors.

Conclusion

The Virtual USB Bus Error 39 in Mastercam X7-2022 can be caused by various factors, including outdated device drivers, USB port issues, software conflicts, and registry errors. By trying the solutions outlined in this report, users should be able to resolve the error and continue using the software without issues.

Recommendations

Regularly update device drivers to prevent outdated drivers from causing errors.
Ensure that the USB port is functioning properly and not damaged.
Uninstall and reinstall Mastercam X7-2022 if issues persist.
Run a registry repair tool to scan and repair any registry errors.

Additional Information

If none of the solutions outlined in this report resolve the issue, it is recommended to:

Contact Mastercam support for further assistance.
Check online forums and communities for similar issues and solutions.
Seek assistance from a qualified IT professional or a Mastercam certified technician.

The "Virtual USB Bus Error 39" in Mastercam (X7 through 2022) is a notorious headache usually caused by Windows Security features blocking older emulator drivers. 🛠️ Most Likely Fix: Disable Memory Integrity

Windows 10 and 11 have a security feature called Core Isolation that prevents "unsigned" or older drivers from loading. This is the #1 cause of Error 39 for Mastercam virtual bus drivers. 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. The driver should now load correctly in Device Manager. 💻 Alternative: Registry Fix

If disabling Core Isolation doesn't work, there might be a corrupted "UpperFilters" or "LowerFilters" entry in your registry. Press Win + R, type regedit, and hit Enter.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36fc9e60-c465-11cf-8056-444553540000 In the right pane, look for UpperFilters or LowerFilters. Right-click and Delete them. Restart your PC. ⚡ Quick Troubleshooting Tips

Driver Signature Enforcement: If you are on a 64-bit system, Windows might be blocking the driver because it isn't digitally signed. Try booting into "Disable Driver Signature Enforcement" mode to see if it clears the error.

Reinstall HASP Drivers: Sometimes the virtual bus gets tangled with physical HASP key drivers. Download the latest Sentinel LDK Runtime from Thales (formerly SafeNet) and do a clean install.

Clean Registry: If you've tried multiple versions (X7 and 2022 on one machine), remnants of old drivers can cause conflicts. Use a tool like CCleaner or manually scrub "Virtual USB Bus" entries from the registry.

🛡️ Note: Disabling Core Isolation reduces a layer of protection against malware. Only do this if you trust your local network and the drivers you are installing. If you'd like, I can help you: Find the latest official drivers for your specific version.

Walk through manual driver uninstallation in Device Manager.

Check if your Windows version (Pro vs Home) has specific group policy blocks.

Let me know which Windows version you're running and if you've recently updated your OS! Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

The "Mastercam X7-2022 Virtual USB Bus Error 39" typically occurs because a Windows security feature blocks the driver or because of corrupted registry entries. Primary Fixes for Error Code 39

Disable Memory Integrity (Core Isolation): This is the most common solution for virtual drivers on Windows 10 and 11. Open Windows Security and navigate to Device Security. Click on Core isolation details. Toggle Memory integrity to Off. Restart your computer to apply the changes.

Delete Corrupted Registry Filters: Corrupted registry keys can prevent the virtual bus from loading. Press Win + R, type regedit, and hit Enter. The Mastercam Virtual USB Bus Error (Code 39)

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000. In the right pane, find UpperFilters and/or LowerFilters. Right-click and Delete these values. Restart your computer.

Reinstall Virtual USB Drivers: Completely removing and resetting the driver can resolve persistent conflicts.

Open Device Manager and expand Universal Serial Bus controllers.

Right-click the problematic "Mastercam Virtual USB Bus" (or similar MultiKey entry) and select Uninstall device.

Restart your PC to allow Windows to attempt a clean reinstallation of the bus. Additional Troubleshooting Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

Mastercam Virtual USB Bus Error 39 typically occurs in Windows 10 and 11 environments because of a conflict between the virtual hardware key (HASP/dongle) drivers and modern Windows security features. This error prevents Windows from loading the necessary driver for the hardware, effectively locking users out of the Mastercam software. The Core Cause: Memory Integrity

The most frequent cause of Error 39 is a Windows security feature called Core Isolation (specifically Memory Integrity

. This feature prevents unauthorized code from accessing high-security processes but often flags the virtual USB bus drivers used by legacy or specific software versions like Mastercam X7–2022 as incompatible or "corrupted" Effective Solutions

To resolve this error and restore Mastercam functionality, users can apply the following methods: How to Fix USB Driver Error Code 39 - Matsusada Precision

Phase 2: Fresh Installation of Correct Drivers

Now that the system is clean, we install the correct, signed drivers.

Step 7: Install CodeMeter Runtime (Not HASP) For Mastercam 2017 through 2022, CodeMeter is the standard. For X7-X9, use HASP. Download the latest:

CodeMeter: Go to Wibu-Systems official site → Download CodeMeter SDK → Run CodeMeterRuntime.exe (as Admin).
HASP (for older): Download "Sentinel HASP/LDK Runtime" from Thales.

Step 8: Install the Specific Mastercam Virtual Bus Driver CNC Software provides this in your Mastercam installation folder.

Navigate to C:\Program Files\Mastercam 2022\Resources\ or your version's folder.
Look for VirtualUsbBusDriverSetup.exe or Install_VirtualHasp.bat.
Right-click → Run as Administrator.

Step 9: Force Driver Re-Initialization

Open Device Manager.
Click Action > Scan for hardware changes.
The "Mastercam Virtual USB Bus" should now appear without a yellow exclamation mark.

Solution 3: Registry Repair (Code 39 Specific Fix)

If the error persists, the issue is likely a corrupted Windows Registry filter. Warning: Editing the registry carries risk. Back up your data before proceeding.

Open the Start Menu, type regedit, and press Enter.
Navigate to the following path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\4D36E967-E325-11CE-BFC1-08002BE10318
Look in the right pane for keys named "UpperFilters" and "LowerFilters".
- Note: These keys relate to disk drives, but sometimes filter conflicts affect USB emulation.
If you see these keys, double-click them and delete the contents, or delete the keys entirely.
Additionally, navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB
- You may need to take ownership of this key to edit it. Look for entries related to "SafeNet" or "HASP" and delete them to force Windows to rediscover the hardware.
Restart the computer.

Solution B: Roll Back Windows Update (KB5028185 / KB5031356)

Microsoft’s updates in late 2023 and mid-2024 tightened driver security. Specifically, KB5028185 (July 2023) and KB5031356 (October 2023) broke Mastercam Virtual USB Bus drivers. To fix:

Go to Settings > Windows Update > Update history > Uninstall updates.
Uninstall these specific KBs. Then pause Windows Updates for 30 days.

2.1 The Hasp Sentinel LDK Architecture

Mastercam utilizes SafeNet Sentinel HL (Hasp) keys. When installed, the Sentinel Runtime creates a virtual bus controller, typically listed in Windows Device Manager under "Universal Serial Bus controllers" as "SafeNet Sentinel HL Key" or "Aladdin HASP Key." Outdated or Corrupt Device Drivers : Outdated or

This virtual bus is not a physical USB port; rather, it is a software layer that intercepts communications from the USB port and translates them for the protection key validation logic.