An attempt to update the HASP driver may have failed, leaving behind faulty registry entries. Step-by-Step Fixes for Virtual USB Bus Error 39
Troubleshooting Mastercam Virtual USB Bus Error 39 (Updated for 2022-2025)
Navigate to the following path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity mastercam x72022 virtual usb bus error 39 updated
Locate the entry with a yellow exclamation mark (e.g., Virtual USB Bus , MultiKey ). Right-click it and select .
Leftover registry keys from older Mastercam installations block the new emulator from initializing. Step 1: Disable Windows Memory Integrity (Core Isolation) An attempt to update the HASP driver may
This paper addresses a persistent system error encountered by users operating older versions of Mastercam (specifically X7) or transitioning between legacy and modern releases (such as the 2022 iteration). The error, designated as Windows Device Manager , manifests as a failure to initialize the "Mastercam Virtual USB Bus." This failure effectively prevents the software from validating the licensing dongle (HASP HL), rendering the application unusable. This document analyzes the root causes—specifically driver stack corruption and Upper/Lower Filter registry conflicts—and outlines a remediation strategy based on registry modification and driver re-installation.
Mastercam X7 uses an older HASP driver that is not digitally signed for Windows 10/11. By default, Windows blocks it, causing Error 39. You can bypass this temporarily or permanently. Windows blocks it
can corrupt the local user profile, preventing the virtual USB controller from verifying its license path. Step-by-Step Fixes (Updated)
3. Reinstall and Digitally Sign the Virtual MultiKey / HASP Driver Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups