Mastercam X7-2022 Virtual Usb Bus Error 39 May 2026

The Virtual USB Bus Error 39 in Mastercam (X7 through 2022) typically indicates that Windows cannot load the required hardware driver because it is either corrupted, missing, or blocked by system security features. This error often appears as a yellow exclamation mark in the Device Manager under "Universal Serial Bus controllers" or "Virtual USB Bus Enumerator".

Below is a draft for a blog post providing step-by-step solutions to resolve this issue. How to Fix Mastercam Virtual USB Bus Error 39

Running legacy or even modern versions of Mastercam (X7 to 2022) can sometimes lead to the frustrating Virtual USB Bus Error 39. This error usually means your license dongle (HASP) or the virtual bus driver used to communicate with it isn't loading correctly. Here is how to fix it. 1. Disable Core Isolation (Memory Integrity)

The most common cause for Error 39 on Windows 10 and 11 is a security feature called Core Isolation. This feature can block older drivers from loading into memory. Open the Start Menu and type Windows Security. Go to Device Security > Core isolation details. Toggle Memory integrity to Off. Restart your computer for the changes to take effect. 2. Clear Registry "Filters"

If disabling Core Isolation doesn't work, corrupted "UpperFilters" or "LowerFilters" in the Windows Registry might be the culprit. Press Win + R, type regedit, and hit Enter.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000.

In the right-hand pane, look for UpperFilters or LowerFilters. Right-click and Delete these entries. Restart your PC. 3. Reinstall USB Controllers Sometimes the driver stack just needs a hard reset. How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial]

Based on discussions regarding the "Mastercam X7-2022 Virtual Usb Bus Error 39" (often related to HASP/emulation issues and Windows user profile corruption), here is the consolidated troubleshooting information. Cause of the Error This error often occurs due to a corrupt Windows user profile

, which can happen if multiple instances of Mastercam are open when a system crash occurs Google Groups Recommended Solution: Delete/Reset Windows User Profile Mastercam X7-2022 Virtual Usb Bus Error 39

Deleting the affected Windows user profile has been reported to resolve the issue, allowing Mastercam to launch again Google Groups Steps to resolve: Backup Data:

Ensure the user has backed up any important files from their desktop or documents folder. Delete Profile: Delete the corrupted user profile in Windows. Create New Profile: Have the user log in again to create a new profile. Re-configure:

The user will need to rearrange their desktop icons and settings. Other Potential Fixes Reinstall HASP Drivers:

Since this is a "Virtual USB Bus" error, reinstalling the Sentinel HASP/LDK License Manager drivers is a common troubleshooting step for HASP-related errors Check for Multiple Instances:

Avoid running multiple instances of Mastercam simultaneously to prevent profile corruption.

Note: The user profile solution is reported to be the most common fix for this specific issue Google Groups Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

The "Virtual USB Bus Error 39" in Mastercam (X7 through 2022) is a common driver conflict typically caused by Windows security features or corrupted registry entries

. This error indicates that Windows cannot load the device driver because it is either corrupted or missing. Primary Cause: Core Isolation (Memory Integrity) The Virtual USB Bus Error 39 in Mastercam

The most frequent cause for this error in modern Windows 10 and 11 environments is a security feature called Core Isolation

. Older Mastercam virtual USB drivers are often incompatible with this feature. How to Fix Windows Security Navigate to Device security Core isolation details Memory integrity Restart your computer to apply the changes. Secondary Cause: Corrupted Registry Filters

If disabling Core Isolation doesn't work, the error may stem from corrupted "UpperFilters" or "LowerFilters" in the Windows Registry, which prevent the virtual bus from loading correctly. How to Fix , and press Enter. Navigate to:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 In the right pane, look for UpperFilters LowerFilters Right-click and these values. Restart your computer. Additional Troubleshooting Steps The Driver May Be Corrupted or Missing. (Code 39 Solution)

Solution 4: Compatibility Mode (For Legacy X7 Users)

If you are specifically trying to run the older X7 version on a modern computer (Windows 10/11), the driver is likely too old.

  1. Navigate to the Mastercam X7 executable file.
  2. Right-click and select Properties.
  3. Go to the Compatibility tab.
  4. Check Run this program in compatibility mode for: and select Windows 7.
  5. Check Run this program as an administrator.
  6. Apply and try to run the software.

Phase 1: Clean Uninstall of All Licensing Components

Standard uninstalls leave registry keys behind. We need a nuclear clean.

Step 1: Disable Driver Signature Enforcement (Temporary)

  • Hold Shift while clicking Restart.
  • Go to Troubleshoot > Advanced Options > Startup Settings > Restart.
  • Press F7 (Disable driver signature enforcement). Note: This is temporary but necessary to remove stubborn drivers.

Step 2: Uninstall via Windows Settings

  • Go to Settings > Apps > Installed Apps.
  • Uninstall everything related to: "CodeMeter," "HASP SRM Runtime," "Sentinel HASP," and "Mastercam Licensing."

Step 3: Manual Device Manager Removal

  • Open Device Manager (Win + X > Device Manager).
  • Click View > Show hidden devices.
  • Under System devices, right-click "Mastercam Virtual USB Bus" and "Aladdin HASP Key" > Uninstall device.
  • Critical: In the confirmation dialog, check "Delete the driver software for this device."

Step 4: DriverStore Exploitation (The Real Fix) Windows keeps a cache of old drivers. We must purge it.

  • Open Command Prompt as Administrator.
  • Type: pnputil /enum-drivers and find any entry containing "Mastercam," "VirtualUsb," "hasp," or "codemeter." Note the Published Name (e.g., oem23.inf).
  • Delete it: pnputil /delete-driver oem23.inf /uninstall /force
  • Repeat for all related entries.

Step 5: Registry Cleanup

  • Press Win + R, type regedit, navigate to:
    • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ – Delete folders named HaspNT, Hardlock, CodeMeter, VirtualUsb.
    • HKEY_LOCAL_MACHINE\SOFTWARE\WIBU\ – Delete the entire WIBU key.
    • HKEY_LOCAL_MACHINE\SOFTWARE\Aladdin\ – Delete the Aladdin key.
  • Backup the registry first (File > Export).

Step 6: Reboot

Phase 2: The Official Driver Clean & Reinstall (GOLDEN FIX)

For 80% of users, this resolves Error 39 completely. The goal is to purge every trace of the old driver before installing the latest version.

Solution C: The "Codemeter Host" Conflict

If you use both a physical USB dongle (NetHASP) and a virtual license, they conflict.

  • Unplug all physical HASP keys.
  • In Services.msc, stop and disable "CodeMeter WebAdmin."
  • Ensure only one licensing service is running.

Still Stuck?

Error 39 on the Virtual USB Bus is stubborn but not fatal. If none of the above works:

  • Try the key on a different PC – if it works there, the issue is your OS, not the key.
  • Contact your Mastercam Reseller – they have internal driver cleaners and version-specific fixes.
  • Check the official Mastercam Forum (forum.mastercam.com) – search “Code 39” for version-specific threads.

Final note: If you are using a cracked or emulated “Virtual USB Bus” (non-genuine key), Error 39 is often intentional—Microsoft’s security updates actively block many legacy emulators. In that case, the only reliable fix is moving to a legitimate Mastercam license. Solution 4: Compatibility Mode (For Legacy X7 Users)

Have you beaten Error 39 with another method? Share your experience in the comments below.

Mastering the Fix: Resolving Mastercam X7-2022 "Virtual USB Bus Error 39"