Navigate to > Advanced options > Startup Settings > Restart .
If you see UpperFilters or LowerFilters in the right pane, right-click and delete them. Note: Only delete filters related to Virtual USB or Aladdin/SafeNet. Restart your computer. Preventing Future Errors (Mastercam X7-2022)
Error 39 occurs when Windows cannot load the driver required for the virtual USB bus, which is often created by HASP emulation software used for licensing. Key causes include:
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To prevent Error 39 from interrupting your machining operations down the road, consider implementing these best practices:
Whether you are using a or a software-based emulator .
Type the following command and hit Enter: bcdedit /set nointegritychecks on Restart your PC. Method 3: Clean Registry LowerFilters and UpperFilters Navigate to > Advanced options > Startup Settings > Restart
Look for the GUID that corresponds to USB devices. (This can vary, but often involves finding entries related to Virtual USB).
This error occurs when Windows cannot load the driver for the virtual USB device, specifically stating that the driver is corrupted or missing. This is a crucial, high-level overview of how to fix this issue, ensuring your CAM workstation returns to full functionality. What Causes the Virtual USB Bus Error 39?
For 80% of users, this resolves Error 39 completely. The goal is to purge every trace of the old driver before installing the latest version. Restart your computer
If the driver works after a temporary disable, you can make the change permanent using these steps:
If Step 1 did not work, the registry entry for the virtual bus is likely corrupt. Right-click the Start menu and select . Expand Universal Serial Bus controllers . Look for "Virtual USB Bus Enumerator" .