Mastercam X72022 Virtual Usb Bus Error 39 | Fix

If Windows keeps reinstalling the wrong driver, force-feed it the correct one.

The Virtual USB Bus driver (vusbbus.sys) is test-signed. Windows blocks it unless test signing is on.

How to enable:

After restart, you'll see "Test Mode" in the lower-right corner of the desktop. That's normal. mastercam x72022 virtual usb bus error 39 fix

Verification:
Open Device Manager → System devices → Virtual USB Bus (still showing error?). If yes, proceed to Step 2.

To revert later (after successful license detection):

bcdedit /set testsigning off

Navigate to:

C:\Windows\System32\drivers\

Delete:

Last Updated: October 2025
Applies to: Mastercam X7, Mastercam X9, Mastercam 2017, Mastercam 2018, Mastercam 2019, Mastercam 2020, Mastercam 2021, Mastercam 2022 (and some legacy HASP/NetHASP installs) If Windows keeps reinstalling the wrong driver, force-feed

If you are a CNC programmer or machinist, few things are as frustrating as launching Mastercam only to be greeted by a cryptic error message:

"Windows cannot start this hardware device because its configuration information (in the registry) is incomplete or damaged. (Code 39)"

This error, appearing in your Device Manager under a node called "Virtual USB Bus" (often accompanied by a yellow exclamation mark), is the notorious Error 39. It completely prevents Mastercam from communicating with your HASP key (the hardware USB dongle that holds your software license).

This article will explain why this happens, the critical differences between Mastercam X7 and 2022, and provide a step-by-step master fix that works across all affected versions.

Corrupted driver files are the #1 cause. Here’s how to force a clean reinstallation: Install manually:

Mastercam’s virtual USB bus often conflicts with:

Resolution: