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Here’s the long-story-short version of how the Mastercam X7 + Windows 10/11 + Virtual USB Bus error 39 typically gets fixed — because that error has ruined many a Monday morning.

Phase 2: Remove Corrupted Driver Remnants

Error 39 often persists due to stale registry data.

  1. Open Device Manager (Win+X → M).
  2. Expand System devices.
  3. Right-click Virtual USB Bus → Uninstall device.
    • Check "Delete the driver software for this device" if available.
  4. Now, open Command Prompt as Administrator.
  5. Run the following commands: 
    set devmgr_show_nonpresent_devices=1
start devmgmt.msc
  6. In the new Device Manager, click View → Show hidden devices.
  7. Remove any grayed-out "Virtual USB Bus" or "HASP" entries.

Overview

This write-up analyzes the issue described by the query "mastercam x7 2022 virtual usb bus error 39 fixed" — i.e., Virtual USB Bus error 39 when using Mastercam X7 (or Mastercam 2022/X7-era) — and provides causes, diagnosis steps, fixes (software and Windows-level), prevention, and references for further troubleshooting.

How Windows Error Code 39 appears

  • Device Manager → right-click device → Properties → "This device cannot start. (Code 10)" or "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)" depending on device; for virtual USB bus it's normally code 39.
  • Event Viewer may show driver load failures.

2. Disable driver signature enforcement (critical for old X7 drivers)

  • Shift + Restart → Troubleshoot → Advanced Options → Startup Settings → Restart
  • Press 7 or F7 for “Disable driver signature enforcement”
  • Boot normally

Summary: The Golden Sequence

For mastercam x72022 virtual usb bus error 39 fixed, follow this sequence exactly:

Disable Signature Enforcement → Uninstall old bus → Clean registry (delete Upper/LowerFilters) → Reboot → Install HASP 8.31+ drivers → Reboot → Run NHASPX diagnostics.

Do not skip the registry step—it is the #1 solution that forums miss. mastercam+x72022+virtual+usb+bus+error+39+fixed

Chapter 1: Anatomy of Error 39

Error 39 is a Windows kernel-level PnP (Plug and Play) error. It doesn't mean "license expired." It means: Windows sees a device (virtual or physical), loads a driver, but the driver tells the OS, "I can't start. Something is wrong with the hardware or its configuration."

In Mastercam's case, the "hardware" was a virtual USB bus—a software-emulated USB controller created by the license manager (typically SafeNet / Sentinel HASP). The physical USB dongle plugged into a real port, but the HASP driver created a virtual bus inside Windows, then mounted the dongle's cryptographic keys on that bus.

Why?

  • To hide the dongle from naive cloning attempts.
  • To manage multiple logical channels (network licenses, standalone, etc.).
  • To enforce ring-0 protection.

After the Windows 11 update (or a Windows 10 22H2 cumulative update), Microsoft tightened driver signature enforcement and changed how USBHUB.SYS and Winusb.sys interact with virtual root hubs. The HASP driver—signed with a SHA-1 certificate from 2012—was now considered "untrustworthy."

Windows loaded it but refused to start the virtual bus device. Error 39. Here’s the long-story-short version of how the Mastercam

4. If Virtual USB Bus still missing or error 39 persists

  • Open Device Manager → Action → Add legacy hardware
  • Next → Install manually → System devices → Have disk
  • Browse to: C:\Program Files (x86)\SafeNet\Sentinel HASP → Select multikey.inf (or vusbbus.inf if present)
  • Force install Virtual USB Bus
  • Ignore unsigned driver warning

Step 3: The Registry Fix (Directly Targets Error 39)

Error 39 in the Virtual USB Bus is often caused by a corrupted UpperFilters or LowerFilters registry value. Here is the manual fix:

  1. Press Win+R, type regedit, press Enter.

  2. Navigate to:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000

    Note: This GUID corresponds to USB host controllers and virtual root hubs.

  3. On the right pane, locate:

    • UpperFilters
    • LowerFilters

  4. Delete both values (right-click → Delete). Do not delete any other entries.

  5. Now navigate to:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\vusbbus

    If this key exists, delete the entire vusbbus key.

  6. Close Registry Editor and reboot.

After reboot, Windows will rebuild the USB bus stack. Reinstall the Virtual USB Bus driver from scratch using the Mastercam HASP installer. Phase 2: Remove Corrupted Driver Remnants Error 39