Mastercam X72022 Virtual Usb Bus Error 39 Fix Official

The Virtual USB Bus Error 39 in Mastercam versions from X7 through 2022 is typically caused by a Windows security feature called Core Isolation (Memory Integrity), which prevents unsigned or older drivers from loading.  Primary Fix: Disable Memory Integrity 

Fix 5: Reinstall CodeMeter + Mastercam Licensing Components

For Mastercam 2021–2022, Error 39 often stems from a broken CodeMeter installation. mastercam x72022 virtual usb bus error 39 fix

1. Check Windows Event Viewer → Windows Logs → System. Look for errors from source Service Control Manager or PlugPlayManager referencing vusbbus.
2. Use a different USB port (preferably USB 2.0, not 3.x).
3. Test on a different PC to confirm the HASP dongle itself isn’t failing.
4. Consider switching to NetHASP (network license) – avoids local Virtual USB Bus entirely.
5. Last resort: Reinstall Windows clean (not reset) – ensures no lingering driver or security policy corruption.

Part 5: Preventing Error 39 from Returning

Once fixed, you can avoid recurrence with these best practices: The Virtual USB Bus Error 39 in Mastercam

• Navigate to C:\Program Files\Mastercam and delete the folder.
• Navigate to C:\Windows\System32\drivers and look for files named hasp.sys, haspnt.sys, or vusb.sys. Delete them if present.

1. Understanding Error 39: Why It’s Not a Normal Driver Failure

Standard driver errors (Code 31, 32) often resolve by reinstalling. Error 39 is different: Check Windows Event Viewer → Windows Logs → System

To fix the Virtual USB Bus Error 39 in Mastercam (X7 through 2022), you typically need to

This appears in Device Manager under System devices as a broken entry named Virtual USB Bus. The error prevents the HASP (Hardware Against Software Piracy) or NetHASP license dongle from being recognized, rendering Mastercam unusable.

Then he wrote a single sticky note for the morning shift: “If Error 39 returns, delete UpperFilters. Also, check your CMOS battery. Time bombs love dead clocks.”