Mastercam X72022 Virtual Usb Bus Error 39 Fix ❲Edge PROVEN❳

Mastercam X7/2022 "Virtual USB Bus Error 39": Complete Fix Guide

Last Updated: October 2025
Applies to: Mastercam X7, Mastercam X9, Mastercam 2017, Mastercam 2018, Mastercam 2019, Mastercam 2020, Mastercam 2021, Mastercam 2022 (and some legacy HASP/NetHASP installs)

"Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)" mastercam x72022 virtual usb bus error 39 fix

How to enable:

  • Disable and Re-enable Virtual USB Bus:

    Fixing Virtual USB Bus Error 39 in Mastercam X7 2022 Mastercam X7/2022 "Virtual USB Bus Error 39": Complete

    If disabling security doesn't work, corrupted registry values may be preventing the driver from loading. , and press Enter. Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\ Find the folder: 36FC9E60-C465-11CF-8056-444553540000 In the right pane, look for UpperFilters LowerFilters . Right-click and your computer. 3. Reinstall HASP Drivers Disable and Re-enable Virtual USB Bus: Fixing Virtual

    Modern versions of Windows 10 and 11 include a security feature called Memory Integrity (part of Core Isolation). This feature prevents unauthorized code from running in high-security processes but frequently blocks older virtual drivers used by Mastercam emulators. Experts from Matsusada Precision and RT Systems identify this as the leading cause of Code 39 errors for USB-related hardware. How to Fix: Open Windows Security and navigate to Device Security. Click on Core isolation details. Toggle Memory integrity to Off. Restart your computer to apply changes. Secondary Cause: Corrupted Registry Filters

    The Virtual USB Bus Error 39 in Mastercam versions ranging from X7 to 2022 is primarily caused by Windows security features blocking unsigned or outdated virtual drivers. Primary Fix: Disable Core Isolation