Mastercam X7-2022 Virtual Usb Bus Error 39 May 2026

Mastercam Virtual USB Bus Error 39

The is a critical driver issue occurring on Windows 10 and 11, primarily caused by Core Isolation (Memory Integrity) security features blocking the Virtual USB Bus driver . This error prevents Mastercam from verifying its HASP/NetHASP security dongle, essentially locking the software out of its license. Core Causes

  1. Update Device Drivers:

    Memory Integrity (HVCI):

    Modern Windows security settings block drivers that don't meet strict virtualization standards. Mastercam X7-2022 Virtual Usb Bus Error 39

    1. BACKUP registry and create a system restore point before changes.
    2. Under HKLM\SYSTEM\CurrentControlSet\Enum\USB and HKLM\SYSTEM\CurrentControlSet\Services, locate entries tied to the device and remove only if you know they are the broken vendor entries.
    3. Reinstall the driver package as Administrator.

    For advanced users only:

    Tom followed that path. He uninstalled the driver (Device Manager let him), rebooted, and re-ran the Mastercam maintenance executable to reinstall protection drivers. Windows balked: “The driver is not digitally signed” read one dialog. The new Mastercam installer, Tom realized, had swapped in a different version of the hardware driver that conflicted with the legacy dongle service. Mastercam Virtual USB Bus Error 39 The is

    1. Navigate to C:\Windows\System32\drivers
    2. Locate hardlock.sys or haspflt.sys
    3. Rename them (e.g., hardlock.old)
    4. Copy fresh versions from a working Mastercam installation or official driver package.
    5. Run in Command Prompt (Admin):
      pnputil /add-driver "C:\path\to\your\inf\file.inf" /install

    If disabling Core Isolation doesn't work, there might be a corrupted "UpperFilters" or "LowerFilters" entry in your registry. Press Win + R , type regedit , and hit Enter. Update Device Drivers : Memory Integrity (HVCI): Modern