Mastercam+x72022+virtual+usb+bus+error+39+fixed (2026)

Which are you currently running?

This error appears specifically within under the System Devices node, attached to a component named "Virtual USB Bus" or "HASP Key – Virtual USB Bus." The symptom is immediate: Mastercam (versions X7 through 2022) fails to detect the license, refuses to start, or throws a "No SIM found" error.

These versions use modern licensing configurations. If you encounter Error 39 here, it is highly likely that a third-party virtual machine environment (like VirtualBox or VMware) or an outdated USB-over-IP tool is creating a hardware conflict with the Mastercam software key. Summary Checklist for a Clean Fix Action Item Target System Component Expected Outcome Turn off Memory Integrity Windows Defender Security Stops Windows from blocking unverified emulation scripts. Execute haspdinst.exe -i Command Line Utility

, find the Virtual USB Bus with the yellow exclamation mark, right-click, and select Uninstall device

A. Restart and simple checks

Following these steps sequentially eliminates the system-level restrictions causing , allowing your virtual USB bus to load seamlessly alongside Mastercam versions X7 through 2022. To ensure we completely clear this up, let me know: Which Windows version (10 or 11) are you running?

Right-click it and choose . Check the box to "Attempt to remove the driver for this device." Extract the downloaded MultiKey folder. Right-click install.cmd and select Run as Administrator .

Navigate to > Advanced options > Startup Settings > Restart . Press 7 or F7 to "Disable driver signature enforcement." Registry UpperFilters/LowerFilters Removal :

Error 39 is a clear indication that Windows security policies are blocking an unsigned or revoked driver from loading. The best and most recommended solution is to use an updated universal license driver (Method 6) that is compatible with modern Windows security requirements. If that is not possible, disabling driver signature enforcement (Method 4) provides a reliable workaround, though it may require a few extra steps each time you start your computer. mastercam+x72022+virtual+usb+bus+error+39+fixed

A standard reinstall often fails because it leaves behind corrupted files.

Fixing the "Virtual USB Bus Error 39" in Mastercam (X7 through 2022) usually comes down to resolving a conflict between older drivers and modern Windows security features like . Fixing Mastercam Virtual USB Bus Error 39

If the system still fails to load the driver, you may need to clear corrupted filter entries in the registry. Press Win + R , type regedit , and press Enter.

To help narrow down the solution, please provide a few more details: Which specific (10 or 11) are you running? Which are you currently running

Ensure the active type matches your emulator configuration (e.g., or NetHASP ).

The "Code 39" error for the Mastercam Virtual USB Bus (often associated with

This error typically happens right after a major Windows Update. Modern Windows security layers flag older or unverified hardware emulator drivers as a major threat, actively blocking them from launching. Root Causes of Error 39

Technical users often find that Windows updates silently re-enable security features that break these virtual drivers. If you encounter Error 39 here, it is

Navigate to the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\ Look for the GUID 36fc9e60-c465-11cf-8056-444553540000 . On the right side, find and LowerFilters . Right-click on them and select Delete . Restart your computer . Method 3: Reinstall/Update Virtual USB Drivers

This is the most common fix for Error 39. Windows requires a special boot mode to allow these virtual drivers to load. Click > Settings > Update & Security > Recovery . Under Advanced startup , click Restart now .