Ensure any previous versions are fully uninstalled via before installing new ones. 3. Clear Registry Filters
If the virtual driver stubbornly refuses to work, but you have a valid network license, you can bypass it entirely.
The update had been sold on speed and streamlined post-processors. The install was smooth. Files loaded. Toolpaths regenerated. On Friday morning Tom plugged in the external dongle — the tiny device that kept his license honest — and launched Mastercam. The software started, then went quiet. Windows flashed an error balloon: “Virtual USB Bus — Error 39.” The license dongle, which had always sat snug in its USB dongle, now showed as an unknown device. Mastercam X7-2022 Virtual Usb Bus Error 39
If you use Mastercam (versions X7 through 2022) with a virtual USB emulator for your hardware license dongle (HASP/HL), you may encounter a disruptive system error. In Windows Device Manager, a yellow exclamation mark appears next to the "Virtual USB Bus" or "Sentinel HASP" driver, accompanied by the following message:
Uninstall the existing driver via or Control Panel . Run the installer for the new driver. Restart your system. Method 4: Reinstall Virtual USB Device Open Device Manager . Expand Universal Serial Bus controllers . Ensure any previous versions are fully uninstalled via
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 In the right pane, look for UpperFilters LowerFilters Right-click and these values. 3. Reinstall MultiKey or HASP Drivers
This error typically manifests in Device Manager as: "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)." The update had been sold on speed and
I can provide specific terminal commands or targeted driver versions based on your setup. Share public link
In the right pane, look for keys named or LowerFilters . If they exist, right-click them and select Delete .
If the files are corrupted, you must clean out the old driver and install a compatible version. Press Windows Key + X and select .
Have you beaten Error 39 with another method? Share your experience in the comments below.