The issue with older versions like Mastercam X7 is that the bundled driver is often too old for modern Windows.
A security feature in Windows 10/11 that blocks unsigned or older drivers.
By following these steps, you should be able to resolve the Virtual USB Bus Error 39 and get Mastercam running smoothly again.
If you’ve tried all 10 fixes and still see Error 39, post your (right-click device → Properties → Details → Hardware Ids) to the Mastercam Forum – the community has seen every variation of this bug.
We've organized these fixes from simple to advanced. Start with Method 1 and work your way down. mastercam x72022 virtual usb bus error 39 fix
Follow it by running: haspdinst.exe -i to reinstall the driver with modern digital signatures. Step 5: Enable Test Signing Mode (If Using Legacy Drivers)
To fix the Virtual USB Bus Error 39 in Mastercam (X7 through 2022), you typically need to
This is a temporary fix. Driver signature enforcement will re-enable on your next normal restart. Use this method to confirm the driver works before pursuing permanent solutions.
If this key exists, set Start to 3 (Manual) instead of 1 or 2. The issue with older versions like Mastercam X7
Look for entries with a yellow warning triangle (e.g., Virtual USB MultiKey , SafeNet HASP , or Sentinel ).
If disabling Memory Integrity does not resolve the issue, the virtual USB driver package itself must be completely wiped and reinstalled. Uninstall the Existing Driver Right-click the and select Device Manager . Expand the Universal Serial Bus controllers section.
To help narrow down the cause of this driver failure, please let me know: What are you currently running?
Navigate to the following path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 If you’ve tried all 10 fixes and still
In the confirmation dialog, before clicking Uninstall.
Type the following command and press : bcdedit /set testsigning on
Navigate to > Advanced Options > Startup Settings . Click the Restart button.