Then sign the modified INF using a self-signed certificate and add it to the Windows Trusted Publishers store (requires disabling Secure Boot temporarily).
C. Remove corrupted drivers and reinstall
: Major Windows feature updates can re-enable Memory Integrity automatically, causing Error 39 to return.
If you still see the yellow exclamation mark after Method 1, it means Windows has stubbornly retained driver files that you need to delete manually. This method uses command-line tools to delete the driver's file repository.
If the driver registry keys are corrupted, you must remove them to allow the virtual driver to reinstall correctly. Press Win + R , type regedit , and hit Enter. mastercam+x72022+virtual+usb+bus+error+39+fixed
Once fixed, protect your setup:
It looks like you have provided a search query or a title for a technical fix regarding Mastercam X7 2022 and a specific Windows error.
Windows blocks the virtual USB bus entirely because it lacks a recognized, modern cryptographic signature. Step-by-Step Fixes for Virtual USB Bus Error 39 Method 1: Disable Core Isolation (Memory Integrity)
This process uses the NSudo tool or Dism++ to run commands with the highest possible system privilege (TrustedInstaller). Then sign the modified INF using a self-signed
F. Reinstall Mastercam license components
Mastercam X7 2022 is a popular computer-aided manufacturing (CAM) software used for CNC machining. However, some users have reported encountering a "Virtual USB Bus Error 39" issue while trying to use the software. This error can be frustrating and prevent you from using the software effectively. In this guide, we will walk you through the steps to fix this error.
Windows 10/11 strict security policies.
Note: Always back up your registry before making manual changes. Verification If you still see the yellow exclamation mark
The "Code 39" error for the Mastercam Virtual USB Bus (often associated with MultiKey or HASP emulators) typically indicates that Windows cannot load the driver because it is either corrupted, missing, or blocked by security features. This issue is common in Windows 10 and 11 environments due to increased security around unsigned or third-party drivers. Primary Cause: Core Isolation (Memory Integrity)
After applying these fixes, check the again. The "Virtual USB Bus" should appear under "System devices" or "USB controllers" without any warning icons.
For Mastercam users employing virtual USB drivers (such as MultiKey) to emulate a USB HASP key, this error occurs because Windows 10/11 security protocols, specifically or Core Isolation (Memory Integrity) , block the driver from loading because it is unsigned or perceived as insecure. Step-by-Step Fix: Resolving Error 39 for Mastercam