Type cmd in the Windows search bar, right-click , and choose Run as administrator . Type bcdedit /set testsigning on and press Enter .
Mastercam relies on the HASP licensing subsystem. An outdated or partially overwritten driver from an older Mastercam version (like X7) running on a newer Mastercam version (like 2022) causes structural version conflicts. Open > Programs and Features . Uninstall Sentinel HASP Driver or Sentinel Runtime .
The "Virtual USB Bus Error 39" is a common licensing and driver conflict issue encountered by Mastercam users, particularly when upgrading software versions (e.g., moving from the legacy X7 version to newer suites like 2022) or migrating to a new computer. Mastercam X7-2022 Virtual Usb Bus Error 39
Preventive tips
Go to > Advanced options > Startup Settings > Click Restart . Type cmd in the Windows search bar, right-click
Restart your computer to allow the virtual driver to load properly. Step 5: Manually Update the Virtual USB Device
If you are updating Mastercam versions, backup your registry first, then clear out old keys associated with outdated virtual USB buses. Restart your PC. Preventive Measures for the Future An outdated or partially overwritten driver from an
Expand the or System devices section.
The user will need to rearrange their desktop icons and settings. Other Potential Fixes Reinstall HASP Drivers:
This Windows security feature isolates computer processes to prevent malware infections. However, it strictly blocks unsigned or legacy drivers from loading into the system memory.
This error typically manifests in Device Manager as: "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)."