If test signing doesn't work, fully disable signature enforcement at boot:
After booting, reinstall the driver as in Step 2.4.
Caveat: This must be done on every boot. Not a permanent solution, but useful for testing.
Windows 10/11 blocks unsigned kernel-mode drivers by default. Older Mastercam virtual bus drivers (pre-2020) often lack valid signatures.
Steps:
Note: This must be repeated after every Windows update or major reboot. For a permanent fix, see Fix 7 (Test Mode).
Before proceeding:
Note for Mastercam 2022 users: Version 2022 uses CodeMeter (Wibu) for licensing, not the Virtual USB Bus. If you see Error 39 with 2022, you are likely running an older HASP-dependent legacy installer or a mixed license environment. The fix below still applies.
Q: Does Error 39 mean my Mastercam license is pirated?
A: Not necessarily. It commonly occurs with legitimate legacy NetHASP licenses when upgrading from Windows 7 to 10/11. mastercam x72022 virtual usb bus error 39 fix
Q: Will Mastercam X7 work on Windows 11?
A: With difficulty. You must use Test Mode + disable Secure Boot. For production, upgrade to Mastercam 2024+.
Q: Can I use a physical USB HASP instead of the virtual bus?
A: Yes. Plug the green HASP key directly into a USB 2.0 port (not USB 3.0). Uninstall the virtual bus driver completely. Mastercam will automatically detect the physical key.
Q: My antivirus keeps deleting vusbbus.sys – what do I do?
A: Add the entire Mastercam and CodeMeter folders to your AV exclusions list before reinstalling.
Mastercam does not talk directly to your USB HASP key. Instead, it installs a virtual driver called the "Virtual USB Bus." This bus acts as an interpreter: it creates a virtual pathway between your physical USB port and Mastercam’s licensing system. If test signing doesn't work, fully disable signature
When you see Code 39 in Device Manager, Windows is telling you that the driver for this virtual bus is present, but its registry entries are corrupt, incomplete, or conflicting with another driver.
Error 39 often appears on machines that previously ran HASP License Manager (Aladdin/Sentinel) for older Mastercam versions (X5, X6).
Sometimes the driver fails because the SYSTEM account loses permission to load it.
Restart and reinstall driver.