Restart your computer and install the driver you downloaded. Method 4: Disable Driver Signature Enforcement If the virtual driver is unsigned, Windows will block it. Go to . Under Advanced startup , click Restart now .
"Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)" Step-by-Step Fixes for Error 39
Windows requires all kernel-mode drivers to be digitally signed by Microsoft. If your Virtual USB Bus software lacks a valid, updated signature, Windows will block it with Error 39. You can temporarily disable this enforcement to test the driver connection. mastercam x72022 virtual usb bus error 39 fix
Option A – Use Mastercam driver installer (recommended):
A: Before taking such a drastic step, consider these options: Restart your computer and install the driver you downloaded
Navigate to the following path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity Look for a DWORD value named . Double-click Enabled and change its value data from 1 to 0 . Click OK and restart your PC.
By following the diagnostic hierarchy—test signing, clean driver removal, old HASP cleanup, and registry permission repair—users can restore full license functionality without reinstalling Mastercam or Windows. Under Advanced startup , click Restart now
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 .
: 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
If you prefer a solution that turned on?