Locate the key corresponding to Universal Serial Bus controllers (typically {36FC9E60-C465-11CF-8056-444553540000} ).
Download the latest from the Thales Customer Support Portal or the Mastercam Support site .
This security feature blocks "unverified" drivers that do not meet the latest Microsoft safety standards.
Sometimes the error is caused by invalid "UpperFilters" or "LowerFilters" keys in the Windows registry that block USB drivers from loading.
In the right pane, look for or LowerFilters . If they exist, right-click and delete them. Restart your PC. 4. Reinstall Sentinel HASP Drivers
The most common cause of Error 39 is , specifically the Memory Integrity setting. Turning this off allows the virtual USB bus to load correctly. Open the Start Menu and search for Windows Security . Navigate to Device security on the left sidebar.
In the , navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\
Open , find the "Virtual USB Bus" with the exclamation point, right-click, and select Uninstall device . Run the new installer and restart your machine. How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial]
If security settings aren't the issue, the driver itself may be outdated. Mastercam relies on drivers.
Mastercam X72022 Virtual Usb Bus Error 39 Updated Portable May 2026
Locate the key corresponding to Universal Serial Bus controllers (typically {36FC9E60-C465-11CF-8056-444553540000} ).
Download the latest from the Thales Customer Support Portal or the Mastercam Support site .
This security feature blocks "unverified" drivers that do not meet the latest Microsoft safety standards. mastercam x72022 virtual usb bus error 39 updated
Sometimes the error is caused by invalid "UpperFilters" or "LowerFilters" keys in the Windows registry that block USB drivers from loading.
In the right pane, look for or LowerFilters . If they exist, right-click and delete them. Restart your PC. 4. Reinstall Sentinel HASP Drivers Locate the key corresponding to Universal Serial Bus
The most common cause of Error 39 is , specifically the Memory Integrity setting. Turning this off allows the virtual USB bus to load correctly. Open the Start Menu and search for Windows Security . Navigate to Device security on the left sidebar.
In the , navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\ Sometimes the error is caused by invalid "UpperFilters"
Open , find the "Virtual USB Bus" with the exclamation point, right-click, and select Uninstall device . Run the new installer and restart your machine. How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial]
If security settings aren't the issue, the driver itself may be outdated. Mastercam relies on drivers.