Open regedit and navigate to the class GUID for USB controllers: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36fc9e60-c465-11cf-8056-444553540000
Error 39 is not a hardware failure; it is a Windows driver policy conflict. While Mastercam 2022 is technically compatible with Windows 11, its legacy Virtual USB Bus driver is not. By forcing the driver through disabled signature enforcement and scrubbing corrupted registry filters, you can restore full functionality.
Sometimes, residual driver files and registry entries persist even after an uninstall, blocking new drivers from installing correctly.
Error 39 in the Virtual USB Bus is often caused by a corrupted UpperFilters or LowerFilters registry value. Here is the manual fix: mastercam+x72022+virtual+usb+bus+error+39+fixed
In some cases, the virtual bus driver itself needs a fresh installation or an updated file set to match modern Windows security standards. Remove Existing Drivers
Windows Device Manager displays a yellow exclamation mark next to the Virtual USB Bus driver, stating: "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)" .
In the context of Mastercam X7 to Mastercam 2022, this usually means Windows Integrity Checks are blocking the third-party virtual driver used to emulate the USB license key. Step 1: Disable Driver Signature Enforcement Open regedit and navigate to the class GUID
After reboot, the system recreates clean filters. Reinstall the Virtual USB Bus driver from Phase 3.
This article is a deep dive into why this error occurs and the exact step-by-step solution to get your Mastercam license recognized again.
If you're seeing "Windows cannot load the device driver for this hardware... (Code 39)" in your Device Manager, try these steps to get back to work: Remove Existing Drivers Windows Device Manager displays a
Remove the old driver by typing: haspdinst.exe -purge or haspdinst.exe -r . Install the fresh driver by typing: haspdinst.exe -i .
as an Administrator to reinstall the updated 64-bit drivers. Advanced Troubleshooting
Once fixed, take these steps to avoid recurrence:
The most common cause of Error 39 on Windows 10/11 is "Memory Integrity," which blocks unsigned drivers, such as those used by USB emulators. Click the and type Windows Security . Select Device Security in the left menu. Click Core isolation details . Toggle Memory integrity to OFF . Restart your computer .