Virtual Usb Bus Error 39 — Mastercam X7-2022

Go to Thales (formerly Safenet) support. Do not use the driver from your Mastercam DVD.

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

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.

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

The Mastercam Virtual USB Bus Error (Code 39) is a driver-related issue that prevents the software from recognizing the necessary security dongle (HASP) or virtual licensing key. It most frequently occurs on Windows 10 and 11 due to modern security features blocking older or non-digitally signed virtual USB drivers. Root Causes

Core Isolation / Memory Integrity: This is the most common cause in Windows 10/11. The security feature blocks drivers that it deems incompatible or unverified.

Corrupted Registry Values: Missing or corrupted "UpperFilters" and "LowerFilters" in the Windows Registry can prevent the USB bus driver from loading.

Outdated/Incompatible Drivers: Older versions of the Mastercam/Aladdin HASP drivers often lack the digital signatures required by modern Windows security protocols.

Windows User Profile Corruption: In some instances, a crash while multiple Mastercam sessions are open can corrupt the user profile, causing persistent startup failures. Recommended Fixes Expected Result Disable Core Isolation

Navigate to Windows Security > Device Security > Core Isolation details and turn Memory Integrity to Off.

Allows Windows to load the "incompatible" virtual USB driver. Registry Cleanup

Use regedit to locate the Class key 36FC9E60-C465-11CF-8056-444553540000 and delete UpperFilters/LowerFilters. Clears conflicting filter drivers that block the USB bus. Update Drivers

Download the latest HASP/LDK drivers from the official Thales (formerly Aladdin) support site.

Replaces corrupted or unsigned files with verified versions. Recreate User Profile

Delete the affected Windows User Profile and log in with a fresh one.

Resolves application crashes linked to corrupted configuration files. Troubleshooting Checklist Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

The "Mastercam X7-2022 Virtual USB Bus Error 39" typically occurs because a Windows security feature blocks the driver or because of corrupted registry entries. Primary Fixes for Error Code 39

Disable Memory Integrity (Core Isolation): This is the most common solution for virtual drivers on Windows 10 and 11. Open Windows Security and navigate to Device Security. Click on Core isolation details. Toggle Memory integrity to Off. Restart your computer to apply the changes. Mastercam X7-2022 Virtual Usb Bus Error 39

Delete Corrupted Registry Filters: Corrupted registry keys can prevent the virtual bus from loading. 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 pane, find UpperFilters and/or LowerFilters. Right-click and Delete these values. Restart your computer.

Reinstall Virtual USB Drivers: Completely removing and resetting the driver can resolve persistent conflicts.

Open Device Manager and expand Universal Serial Bus controllers.

Right-click the problematic "Mastercam Virtual USB Bus" (or similar MultiKey entry) and select Uninstall device.

Restart your PC to allow Windows to attempt a clean reinstallation of the bus. Additional Troubleshooting Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

The Virtual USB Bus Error 39 in Mastercam (X7 through 2022) is typically caused by a Windows security feature called Core Isolation (Memory Integrity), which prevents unsigned or older virtual drivers from loading. Feature Fix: Disabling Memory Integrity

The most effective "feature" to resolve this error is to adjust your system's security settings to allow the virtual driver to function properly.

Open Windows Security: Click the Start menu, type Windows Security, and open it.

Navigate to Device Security: Select the Device security tab on the left-hand menu.

Access Core Isolation: Under the "Core isolation" section, click on Core isolation details.

Disable Memory Integrity: Switch the Memory integrity toggle to Off.

Restart Your PC: You must restart your computer for these changes to take effect and for the driver to load without the Code 39 error. Alternative: Registry Adjustment

If the toggle is grayed out or unavailable in the settings menu, you can disable it via the Registry Editor:

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity Set the Enabled value to 0. Restart your computer.

Note: If the error persists after these steps, it may be due to a corrupt user profile; deleting and recreating the Windows user profile has been known to resolve deep-seated Mastercam launch issues. Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

To resolve the Virtual USB Bus Error 39 (often appearing as "Windows cannot load the device driver for this hardware... Code 39") for Mastercam versions ranging from X7 to 2022, follow these steps. Go to Thales (formerly Safenet) support

This error is primarily caused by Windows security features blocking older virtual drivers or registry corruption 1. Disable Windows Core Isolation (Memory Integrity)

Modern versions of Windows 10 and 11 include a security feature called Core Isolation

that often blocks legacy or virtual USB drivers used by older software licenses. Windows Security from the Start menu. Navigate to Device Security Core isolation details Memory integrity your computer. 2. Registry Fix: Remove Upper/Lower Filters

Corruption in specific registry keys can prevent USB drivers from loading correctly. , and run as administrator. Navigate to the following path:

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. 3. Reinstall MultiKey or HASP Drivers

If the above steps don't work, the driver installation itself may be corrupted. Uninstall Existing Drivers Device Manager

, find the entry with the yellow exclamation mark (usually under "Universal Serial Bus controllers"), and select Uninstall device Clean Reinstall

command files typically found within your MultiKey or HASP driver folder. Latest Drivers : Download the newest HASP/LDK drivers from the official Thales (Sentinel) support site to ensure compatibility with Windows 10/11. 4. Check for Corrupt User Profiles

In some Mastercam environments, the issue has been traced back to a corrupt Windows User profile

, particularly if multiple instances of Mastercam were running during a crash. Creating a new Windows user account and launching Mastercam from there can verify if this is the cause. Google Groups Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

The "Mastercam X7-2022 Virtual Usb Bus Error 39" is a driver-related issue that primarily occurs when Windows security features or corrupted registry entries prevent the virtual USB driver (often associated with MultiKey or HASP emulators) from loading correctly. Primary Causes of Error 39

Core Isolation/Memory Integrity: Modern Windows security features often block older or unsigned drivers, such as those used for virtual USB emulation in older Mastercam versions.

Corrupted Registry Filters: Invalid "UpperFilters" or "LowerFilters" in the Windows Registry can prevent USB controllers from initializing.

User Profile Corruption: In some cases, frequent Mastercam crashes can corrupt the Windows user profile, leading to persistent driver errors.

Driver Incompatibility: Using drivers not designed for the specific version of Windows (e.g., trying to run Mastercam X7 drivers on Windows 11). Step-by-Step Troubleshooting Guide 1. Disable Windows Core Isolation

This is the most common fix for Error 39 on Windows 10 and 11.

Open Windows Settings and navigate to Privacy & security (or Update & Security on Windows 10). Select Windows Security > Device security. Click Core isolation details. Toggle the Memory integrity switch to Off. Restart your computer for the changes to take effect. 2. Modify Windows Registry (Delete Filters) Final note: If you are using a cracked

If the driver is still blocked, you may need to clear corrupted registry keys. Press Windows + R, type regedit, and press Enter.

Navigate to the following key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 In the right pane, locate UpperFilters and LowerFilters. Right-click and Delete these values. Restart your PC. 3. Update or Reinstall Virtual USB Drivers

Sometimes a clean reinstallation of the specific hardware driver is required. Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

The "Virtual USB Bus Error 39" in Mastercam (X7 through 2022) is a notorious headache usually caused by Windows Security features blocking older emulator drivers. 🛠️ Most Likely Fix: Disable Memory Integrity

Windows 10 and 11 have a security feature called Core Isolation that prevents "unsigned" or older drivers from loading. This is the #1 cause of Error 39 for Mastercam virtual bus drivers. Open Windows Security (search for it in the Start menu). Go to Device Security > Core isolation details. Toggle Memory integrity to Off.

Restart your computer. The driver should now load correctly in Device Manager. 💻 Alternative: Registry Fix

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.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36fc9e60-c465-11cf-8056-444553540000 In the right pane, look for UpperFilters or LowerFilters. Right-click and Delete them. Restart your PC. ⚡ Quick Troubleshooting Tips

Driver Signature Enforcement: If you are on a 64-bit system, Windows might be blocking the driver because it isn't digitally signed. Try booting into "Disable Driver Signature Enforcement" mode to see if it clears the error.

Reinstall HASP Drivers: Sometimes the virtual bus gets tangled with physical HASP key drivers. Download the latest Sentinel LDK Runtime from Thales (formerly SafeNet) and do a clean install.

Clean Registry: If you've tried multiple versions (X7 and 2022 on one machine), remnants of old drivers can cause conflicts. Use a tool like CCleaner or manually scrub "Virtual USB Bus" entries from the registry.

🛡️ Note: Disabling Core Isolation reduces a layer of protection against malware. Only do this if you trust your local network and the drivers you are installing. If you'd like, I can help you: Find the latest official drivers for your specific version.

Walk through manual driver uninstallation in Device Manager.

Check if your Windows version (Pro vs Home) has specific group policy blocks.

Let me know which Windows version you're running and if you've recently updated your OS! Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

| Cause | Explanation | |-------|-------------| | Driver signature enforcement (Windows 10/11) | The virtual driver is unsigned or uses a test signature. Modern Windows blocks it. | | Windows Update | A Windows update may break the virtual driver or re-enforce driver signing. | | Corrupted driver installation | Incomplete emulator setup or leftover registry entries. | | Antivirus interference | Antivirus deletes or quarantines key emulator driver files (e.g., multikey.sys, vusbbus.sys). | | Outdated emulator | Emulator designed for older Mastercam versions fails on newer Windows builds. |

Before applying a fix, the system state must be verified.

The error behaves differently across versions. Adjust your approach: