Modern 64-bit versions of Windows (10 and 11) strictly forbid the installation of unsigned third-party drivers.
Download and install the latest HASP drivers from official support sites like Thales Customer Support. 3. Registry Editor Fix (UpperFilters/LowerFilters)
Which you are currently running (Windows 10 or 11)?
that often blocks virtual USB drivers used by older software emulators. Start Menu and search for Windows Security Navigate to Device security Core isolation details Toggle the Memory integrity your computer. Secondary Fix: Registry Filter Deletion mastercam+x72022+virtual+usb+bus+error+39+fixed
Type install.cmd (or the respective filename) and press Enter.
Legacy software like Mastercam X7 may require a specific driver handshake.
A fresh installation often resolves the issue if the previous installation was corrupted. Modern 64-bit versions of Windows (10 and 11)
. Restart your PC to let Windows attempt a clean re-detection. User Profile Corruption : Some Mastercam users report that a corrupted Windows User profile
via the advanced startup menu to allow the virtual driver to load. Google Groups If you'd like, I can help you: exact registry path for your specific Mastercam version. Guide you through disabling Driver Signature Enforcement Troubleshoot Sentinel/HASP driver conflicts. Let me know which Windows version you are currently running. How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial]
Corrupted registry entries can prevent the USB bus driver from initializing correctly. How to Fix USB Driver Error Code 39 - Matsusada Precision Secondary Fix: Registry Filter Deletion Type install
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 In the right-side pane, look for UpperFilters LowerFilters Right-click and these values. Restart your computer to allow Windows to rebuild these filters. 3. Reinstall Virtual USB MultiKey Drivers
The "Code 39" error specifically indicates that Windows cannot load the device driver for this hardware because the driver may be corrupted or missing. In the context of Mastercam’s virtual USB bus, this is often a false positive triggered by and Memory Integrity features in Windows 10 and 11. These security layers block drivers that do not meet strict modern signing requirements, which is common for the third-party virtual bus drivers used to emulate HASP or USB keys. Essential Steps to Fix Error 39
Windows security patches frequently revoke certificates for older Virtual USB MultiKey tools.
If the error persists after the steps above, a clean driver install is necessary: Uninstall Existing Drivers Device Manager
Virtual USB Bus Error 39 in Mastercam versions (including X7 through 2022)
