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

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

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

2. Disable driver signature enforcement (critical for old X7 drivers)

• Shift + Restart → Troubleshoot → Advanced Options → Startup Settings → Restart
• Press 7 or F7 for “Disable driver signature enforcement”
• Boot normally

Phase 5: Reconfigure Mastercam License Manager

1. Open NHASPX.exe (NetHASP License Manager) as Admin.
2. Go to Diagnostics → Run Diagnostics.
3. If the Virtual Bus appears green, click Update.
4. Set environment variable if needed:

   setx NHASP_REDIRECT "auto"
   

The Error

One day — often after a Windows Update, driver update, or reinstall — you see in Device Manager under System devices: The "Code 39" error for the Mastercam Virtual

Virtual USB Bus – Yellow triangle
Error 39: "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing."

Mastercam won’t start. No dongle detection. Illegal software message appears.

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.