Driver Signature Enforcement will re-enable after a normal restart. If the error returns, you can either repeat this process or use the permanent method below.
drivers) in Mastercam typically indicates that Windows cannot load the driver because it is corrupted, missing, or blocked by security features. Microsoft Learn Primary Fixes for Error Code 39 Disable Core Isolation (Memory Integrity)
Warning: Back up your registry by selecting File > Export before making any modifications. Step 5: Reinstall Official Sentinel HASP Drivers mastercam x72022 virtual usb bus error 39 fix
Most modern Windows 10 and 11 systems block older or unsigned drivers via a feature called Memory Integrity. Open from the Start menu. Navigate to Device security > Core isolation details . Toggle Memory integrity to Off . Restart your computer for the change to take effect. Secondary Fix: Registry Edit (DeviceGuard)
If the error persists, proceed step-by-step. Driver Signature Enforcement will re-enable after a normal
To resolve Error 39, try the following troubleshooting steps:
Open by right-clicking the Start button and selecting it from the menu. Microsoft Learn Primary Fixes for Error Code 39
In the context of Mastercam, this error appears on a driver entry named or similar, which is typically found under "System devices" in the Device Manager. This driver is a critical component of the licensing mechanism used by many versions of Mastercam (including the often-referenced X7 through 2022 range). It acts as an emulator, allowing software to communicate with the hardware license key (or HASP) as if it were connected directly.
Running into a "Virtual USB Bus Error 39" when trying to launch Mastercam X7, X9, or newer versions like Mastercam 2022 is a frustratingly common issue, especially after Windows updates. The error message explicitly states: "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)."
Press the , type Device Security , and press Enter . Click on Core isolation details . Toggle the Memory integrity switch to Off . Restart your computer for changes to take effect. 2. Disable Driver Signature Enforcement Permanently