Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 .
Reinstalling the drivers is the first and most common fix for Code 39 errors. Unplug your HASP USB key.
Select your exact Mastercam version from the drop-down menu.
In some cases, multiple crashes can corrupt a user profile, preventing the USB key from being recognized. Step-by-Step Fixes for Virtual USB Bus Error mastercam x72022 virtual usb bus error link
If you can tell me you are using and if this is a new installation , I can give you the exact registry paths to check. Share public link
If the previous steps do not resolve the issue, try the following advanced methods.
Open , go to the View menu, and select Show hidden devices . Expand Universal Serial Bus controllers . Select your exact Mastercam version from the drop-down menu
Select (or Update & Security on older builds). Click on Windows Security , then select Device security . Look for Core isolation details and select it. Switch the Memory integrity toggle to Off . Restart your PC to allow the changes to take effect. 2. Bypass Driver Signature Enforcement
Launch Mastercam from the new profile. If it works, your old profile was the issue. Summary of Solutions Potential Cause Code 39/52 in Device Manager Unsigned Driver Disable Driver Signature Enforcement Mastercam crashes on open Corrupt Profile Delete/Create User Profile USB conflict Too many USBs Unplug peripherals
If your Device Manager shows a yellow exclamation mark next to "Virtual USB MultiKey" or "MultiKey Virtual USB Bus", the driver signature is likely the issue. Share public link If the previous steps do
If you can tell me (10 or 11) and exactly what code is shown in the Device Manager (e.g., Code 39, Code 10), I can help you find a more specific driver fix. Share public link
If Mastercam launches on the new account, you may need to delete and recreate your original local profile. Locate the specific driver files to sign manually.
Use this System Inspector Utility to analyze licensing problems and generate a diagnostic report.