For IT administrators or frequent sufferers, this batch script resets the Multikey in one click.
Save as reset_multikey.bat and Run as Administrator:
@echo off echo Stopping and removing old Multikey... net stop multikey sc delete multikeyecho Removing driver from System32... del /f /q C:\Windows\System32\drivers\multikey.sys
echo Reinstalling driver... copy "%~dp0multikey.sys" C:\Windows\System32\drivers\multikey.sys
echo Creating and starting service... sc create multikey type=kernel start=auto binPath=C:\Windows\System32\drivers\multikey.sys sc start multikey mastercam virtual usb multikey not working
echo Disabling signature enforcement... bcdedit /set testsigning on
echo Restarting Device Manager refresh... pnputil /scan-devices
echo Done. Reboot now? (Y/N) pause
You’ve just installed Mastercam. You’re ready to machine complex parts, but when you launch the software, it freezes, crashes, or greets you with a dreaded "Hasp not found" error.
You check your Device Manager, and there it is—a yellow exclamation mark hovering over the Virtual USB Multikey. Or worse, it’s listed under "Other Devices," floating in digital purgatory.
This is a common headache for CAD/CAM administrators and users. It’s a clash between modern operating systems and legacy driver architecture. Here is the breakdown of why this happens and how to exorcise the ghost.
Provide the following when opening a ticket: For IT administrators or frequent sufferers, this batch
If the Multikey worked yesterday but failed after an automatic update:
Note: This is a temporary workaround. Future updates will re-introduce the block.
If the driver is unsigned, you must tell Windows to relax its security standards temporarily.
Update the Driver Manually: