In the right pane, look for and LowerFilters . If they exist, right-click and Delete them. Restart your computer . 3. Reinstall Virtual USB / HASP Drivers How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial]
Important: Back up system restore point and export registry keys you modify. mastercam+x72022+virtual+usb+bus+error+39+fixed
If Error 39 persists, proceed.
Let me know in the comments. Good luck machining! In the right pane, look for and LowerFilters