Mastercam X72022 Virtual Usb Bus Error 39 Fix -

The Mastercam virtual USB bus error (Code 39) typically occurs because Windows security features or corrupted registry entries prevent the virtual driver from loading. 1. Disable Core Isolation (Memory Integrity)

Modern Windows security often blocks virtual USB drivers like those used by Mastercam. Disabling this feature is the most common fix. menu and search for Windows Security Device security Core isolation details Memory integrity

your computer and check if the driver loads in Device Manager. Matsusada Precision 2. Remove Corrupted Registry Filters

Corrupted "UpperFilters" or "LowerFilters" can block USB device drivers from starting. , and press Navigate to:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 In the right pane, look for UpperFilters LowerFilters Right-click and these values if they exist. your computer. 3. Disable Virtualization-Based Security (Registry) mastercam x72022 virtual usb bus error 39 fix

If you cannot toggle Core Isolation via settings, you can force it off in the registry. Microsoft Learn Registry Editor

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity Microsoft Learn 4. Reinstall Virtual USB Drivers

If the error persists, the driver files themselves may be corrupted. Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups 24 Jul 2024 —

The "Error Code 39" for the Mastercam Virtual USB Bus typically occurs because Windows security features, specifically Core Isolation, block the driver from loading. This error indicates that the driver is corrupted, missing, or more commonly in recent Windows versions, incompatible with modern memory protection. Primary Fix: Disable Core Isolation (Memory Integrity) The Mastercam virtual USB bus error (Code 39)

Most modern Windows 10 and 11 systems block older or unsigned drivers via a feature called Memory Integrity. Open Windows Security from the Start menu. Navigate to Device security > Core isolation details. Toggle Memory integrity to Off. Restart your computer for the change to take effect. Secondary Fix: Registry Edit (DeviceGuard)

If you cannot toggle Memory Integrity in settings, you can force it off via the Windows Registry Editor:

Search for regedit in the Start menu and run as administrator.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity. Set the Enabled value to 0. Restart your system. Additional Troubleshooting Steps Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups Step 6: Final Restart and HASP Plug-in

Step 6: Final Restart and HASP Plug-in

1. Restart your computer (not shut down, but restart).
2. After logging in, plug your physical HASP USB key into a USB 2.0 port.
3. Wait 10 seconds. Open Device Manager again. The "Virtual USB Bus" should now say "This device is working properly."
4. Launch Mastercam.

3. Step-by-Step Fix for Error 39

The X7-Specific Fix:

1. Open Command Prompt as Administrator.
2. Type the following commands, pressing Enter after each:

   bcdedit /set testsigning on
   bcdedit /set nointegritychecks on
   

3. Restart your PC.
4. You will see "Test Mode" watermark in the bottom-right corner of your desktop – this is normal and required for X7.
5. Reinstall the Virtual USB Bus driver following Steps 1–5 above.

To disable Test Mode later (if you stop using X7): Run the same commands but replace on with off and restart.

Step 4: Reinstall the Correct Virtual USB Bus Driver

Now you need a clean installation. Do not plug in your HASP yet.

For Mastercam X7 – 2019 (Legacy Driver):

1. Navigate to your Mastercam installation folder, typically: C:\Program Files\Mastercam X7\
2. Find the Drivers or HASP subfolder.
3. Look for HASPUserSetup.exe or Sentinel_Run-time_installer.exe.
4. Right-click → Run as Administrator.
5. Select "Repair" (if available) or "Install".

For Mastercam 2020 – 2022 (Modern Driver):

1. Download the latest Sentinel HASP/LDK Run-time Installer from Thales (formerly SafeNet). Do not use the version on your Mastercam DVD – it’s likely outdated.
2. Run the installer as Administrator.
3. Choose "Complete" installation, then select "Repair".

After installation completes:

• Do NOT restart yet.
• Open Device Manager → Click Action → Scan for hardware changes.
• The "Virtual USB Bus" should reappear without a yellow exclamation mark.

Step 4: Clean Up Old HASP License Manager (Conflict Resolution)

Error 39 often appears on machines that previously ran HASP License Manager (Aladdin/Sentinel) for older Mastercam versions (X5, X6).

1. Uninstall Sentinel HASP/LDK Runtime from Control Panel.
2. Run the HASP Cleanup Utility (available from Thales/Sentinel).
   • Removes leftover registry keys, services, and drivers.
3. Restart.
4. Reinstall only the Virtual USB Bus driver (not the full HASP runtime).