Mastercam X72022 Virtual Usb Bus Error 39 Fix New! May 2026

To fix the Virtual USB Bus Error 39 for Mastercam (versions X7 through 2022), you typically need to address security features in modern Windows versions that block certain virtual drivers. This error indicates that Windows cannot load the device driver because it is either corrupted, missing, or blocked. Primary Fix: Disable Core Isolation (Memory Integrity)

Causes of Virtual USB Bus Error 39

• Go to the Device Manager (Windows + X and select Device Manager)
• Expand the "Universal Serial Bus controllers" section
• Right-click on "Virtual USB Bus" and select "Disable device"
• Wait for 10 seconds and re-enable the device

Steps:

For each one you find:

Step 2: Remove Corrupt Registry Keys (The Core Fix)

Error 39 lives in the registry. We need to delete the "UpperFilters" and "LowerFilters" keys that Windows is choking on. mastercam x72022 virtual usb bus error 39 fix

1. Corrupted driver store (leftover files from previous Mastercam/CodeMeter installs)
2. Digital signature enforcement (Windows 10/11 blocking older, unsigned virtual bus drivers)
3. Conflicting virtual bus instances (e.g., from VMware, VirtualBox, or older SafeNet drivers)
4. Registry debris from failed uninstalls of Mastercam X7–X9

This guide provides 10 proven methods—from quick registry tweaks to deep driver reinstallations—to banish Error 39 for good. To fix the Virtual USB Bus Error 39

, which often blocks virtual USB drivers used for licensing. Matsusada Precision 1. Disable Core Isolation (Memory Integrity) Go to the Device Manager (Windows + X