In Windows, usually means a driver is corrupt, missing, or blocked by security features like Core Isolation . When using Mastercam with a Virtual USB Bus (often for emulator-based licensing), this error prevents the software from seeing the "hardware" key.
The methods described are relevant for a wide range of Mastercam X-series versions (including 2021, 2022, 2023, and 2024). The core driver names and error behaviors are consistent across these versions.
Once Windows boots up, reinstall your Mastercam virtual USB bus driver.
The error can be caused by a variety of factors, including:
Open regedit and navigate to the class GUID for USB controllers: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36fc9e60-c465-11cf-8056-444553540000 mastercam+x72022+virtual+usb+bus+error+39+fixed
The most effective fix for this specific Mastercam error involves adjusting Windows security settings or cleaning up registry filters.
Because the virtual USB bus driver lack an official Microsoft digital signature, Windows will actively block it until you disable checking protocols.
Here is a breakdown of the components:
If they exist and are not explicitly required by an active, legitimate software program, right-click and them. Restart your computer . Mastercam Version-Specific Considerations In Windows, usually means a driver is corrupt,
In the Device Manager, Error 39 is defined as: "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing."
Let me know in the comments. Good luck machining!
Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 .
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Hold down the while clicking Restart in your Windows Start Menu.
If the error persists after the steps above, a clean driver install is necessary: Uninstall Existing Drivers Device Manager
Disclaimer: This guide is for educational purposes regarding software licensing troubleshooting. Always ensure you are following the proper licensing agreements for your software.