This solution works for . The steps are identical, but driver names vary slightly by version.
For Mastercam 2021–2022, Error 39 often stems from a broken CodeMeter installation.
The "Virtual USB Bus Error 39" in Mastercam (typically appearing for older versions like X7 or when using virtual licensing/HASP tools on modern Windows) generally indicates that Windows has blocked a driver from loading because it doesn't meet security standards or has a corrupted registry entry .
If the error persists, proceed.
This is the most common solution for modern Windows 10 and 11 systems where the driver is blocked by security protocols. mastercam x72022 virtual usb bus error 39 fix
Error 39 typically means Windows cannot load the device driver for the virtual USB bus because the driver is corrupted, unsigned, or conflicting with core Windows security features. This comprehensive guide provides step-by-step solutions to fix this error and get Mastercam running smoothly again. What Causes Error 39 in Mastercam?
This is the most common culprit. Starting with Windows 7 64-bit and continuing through Windows 10 and 11, Microsoft has implemented a feature called "Driver Signature Enforcement." This security measure ensures that only drivers that have been tested and digitally signed by Microsoft can be installed. The drivers used in the Mastercam Virtual USB Bus emulation are often legacy drivers that lack a valid, up-to-date signature. Consequently, Windows blocks them, resulting in Error 39.
This article provides a comprehensive, step-by-step guide to resolving this error and restoring your Mastercam functionality. What is Virtual USB Bus Error 39 in Mastercam?
: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity Action : Set the Enabled DWORD value to 0 . Restart : Reboot your PC after closing the editor. Advanced Troubleshooting This solution works for
Log into Windows and check if Mastercam detects the virtual USB bus. Step 3: Remove the Corrupted Virtual USB Device
Hold the while clicking Restart in the Windows Start Menu.
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
Upon reboot, press or F7 to select Disable driver signature enforcement . The "Virtual USB Bus Error 39" in Mastercam
He tried the usual exorcisms:
Look into the right-hand panel for values named or LowerFilters .
Sometimes, external devices like 3DConnexion mice, or server-mapped Documents folders, conflict with the HASP driver, causing it to load incorrectly.
After investigating various user reports and forums, we've identified several potential causes of the Virtual USB Bus Error 39 in Mastercam X7 2022: