Error Code 39 in Windows Device Manager typically carries the message: "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing" . In the context of Mastercam, this happens because:
Many Mastercam installations use a virtual USB bus (like MultiKey) to manage the HASP/LDK license. Older versions of these virtual drivers are frequently flagged as incompatible by newer Windows updates. Step-by-Step Fixes (Updated for 2024–2025) 1. Disable Core Isolation (Recommended Fix)
The most common cause of Error 39 is , specifically the Memory Integrity setting. Turning this off allows the virtual USB bus to load correctly. Open the Start Menu and search for Windows Security . Navigate to Device security on the left sidebar. mastercam x72022 virtual usb bus error 39 updated
Download the latest from the Thales Customer Support Portal or the Mastercam Support site .
When using , users often encounter the frustrating "Virtual USB Bus Error Code 39." This error prevents the software from recognizing the license key (HASP), rendering the application unusable. Most commonly, this is caused by a security feature in modern Windows versions known as Core Isolation (Memory Integrity) , which blocks older or virtual drivers from loading. Error Code 39 in Windows Device Manager typically
This security feature blocks "unverified" drivers that do not meet the latest Microsoft safety standards.
Open , find the "Virtual USB Bus" with the exclamation point, right-click, and select Uninstall device . Run the new installer and restart your machine. How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial] Older versions of these virtual drivers are frequently
If you cannot toggle Core Isolation via the settings menu, you can force it off through the . Press Win + R , type regedit , and press Enter .
Below is a comprehensive guide to resolving this error for both Windows 10 and 11. Understanding Error Code 39