Mastercam X72022 Virtual Usb Bus Error 39 Updated Guide

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 .

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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) If you cannot toggle Core Isolation via the

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. Many Mastercam installations use a virtual USB bus

Sometimes the error is caused by invalid "UpperFilters" or "LowerFilters" keys in the Windows registry that block USB drivers from loading.

Under the section, click on Core isolation details . Toggle Memory integrity to Off . Restart your computer for the changes to take effect. 2. Modify the Registry (Manual Security Bypass)