Mastercam X72022 Virtual Usb Bus Error 39 Updated Instant

The "Error 39" associated with the Mastercam Virtual USB Bus is a common headache for users running legacy versions of Mastercam on modern Windows operating systems. This error essentially means Windows cannot load the device driver because it may be corrupted, missing, or—most likely—digitally unsigned. The Root Cause: Driver Enforcement

7) Permissions & User Account Control

• Install drivers and Mastercam as an Administrator user.
• Right-click installers → Run as administrator.
• Temporarily lower UAC if necessary for driver installation (restore afterward).

1. Open Device Manager (Right-click Start button).
2. Click View > Show hidden devices.
3. Expand Universal Serial Bus controllers.
4. Look for any grayed-out (faded) entries named Virtual USB Bus, HASP Key, or Sentinel HL Key.
5. Right-click each grayed entry and select Uninstall device.
6. Also expand Key Protection Devices and uninstall any ghost entries there.
7. Restart your PC and re-plug the dongle.

Without this fix, the software is essentially a paperweight. It will crash upon startup or refuse to recognize the license, rendering the expensive CAM suite useless.

2. Disable Driver Signature Enforcement (Temporary Fix)

This allows the unsigned virtual USB driver to load.

System Configuration