Navigate to the following path (paths vary slightly depending on your specific emulator architecture): HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\
Look in the right-hand panel for values named or LowerFilters . Right-click these keys and select Delete .
Sometimes the virtual bus gets tangled with physical HASP key drivers. Download the latest Sentinel LDK Runtime from Thales (formerly SafeNet) and do a clean install.
To resolve Error 39 in Mastercam X7-2022, follow these step-by-step troubleshooting steps: Mastercam X7-2022 Virtual Usb Bus Error 39
| Version | Preferred Driver | Common Error 39 Trigger | | :--- | :--- | :--- | | | Sentinel HASP 8.31+ | Windows 11 block of unsigned drivers | | Mastercam 2017-2018 | CodeMeter 6.90a | Corrupt after SolidWorks installation | | Mastercam 2019-2020 | CodeMeter 7.00 | USB 3.0 controller driver conflict | | Mastercam 2021-2022 | CodeMeter 7.10c | Windows 22H2 update incompatibility |
Below is the comprehensive technical breakdown and step-by-step resolution guide to fix the Virtual USB Bus Error 39. Root Causes of Error 39 in Mastercam Emulators
When you see a yellow exclamation mark next to "Mastercam X7-2022 Virtual USB Bus" in Device Manager, its properties typically show: "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)." Navigate to the following path (paths vary slightly
Standard uninstalls leave registry keys behind. We need a nuclear clean.
Type the following command and hit Enter: bcdedit /set nointegritychecks on Restart your PC. Method 3: Clean Registry LowerFilters and UpperFilters
While Mastercam has evolved significantly from version X7 (released circa 2013) to version 2022, the underlying Sentinel LDK licensing architecture has remained relatively consistent. Consequently, this error is trans-generational, affecting users upgrading operating systems or migrating software versions without updating the licensing runtime environment. Download the latest Sentinel LDK Runtime from Thales
If the driver is still blocked, you may need to clear corrupted registry keys. Press Windows + R , type regedit , and press .
How to Fix Mastercam Virtual USB Bus Error 39 (X7 to 2022) The is a common device driver issue that prevents the software from launching. It typically occurs when Windows blocks the third-party virtual USB emulator used to load Mastercam licenses (from versions X7 up to 2022). Windows Device Manager will display a yellow exclamation mark next to the driver with Code 39, stating that the driver is missing, corrupt, or blocked.
If the error returns after a reboot or Windows Update, you are facing a war.
Users who encounter Error 39 in Mastercam X7-2022 may experience the following symptoms: