Mastercam X72022 Virtual Usb Bus Error 39 Fix [best] -

The Mastercam virtual USB bus error (Code 39) typically occurs because Windows security features or corrupted registry entries prevent the virtual driver from loading. 1. Disable Core Isolation (Memory Integrity)

This feature provides a systematic, field-tested guide to diagnosing and eliminating Error 39 across Mastercam versions X7 through 2022, on Windows 10 and 11 (64-bit only). mastercam x72022 virtual usb bus error 39 fix

Fix 9: Windows System Restore / Reset

  1. Windows 10/11 Updates (Driver Signature Enforcement): Microsoft began enforcing stricter driver signing policies. Older Mastercam drivers (especially from X7 – 2019) are not signed for modern Windows versions.
  2. Antivirus/Endpoint Protection: Programs like Sophos, McAfee, or even Windows Defender sometimes quarantine or block the Haspnt.sys or hardlock.sys files that the Virtual USB Bus depends on.
  3. Conflicting License Managers: If you previously installed a different CAD/CAM license manager (SolidWorks, Autodesk, older Sentinel drivers), they can overwrite critical registry keys.

"Virtual USB Bus"

In the Device Manager, under System Devices or Universal Serial Bus controllers , you see a yellow exclamation mark next to or "Codemeter USB Bus." The Mastercam virtual USB bus error (Code 39)

Uninstall existing driver: