Usb Bus Error 39 | Mastercam X7-2022 Virtual

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 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)

The Mastercam Virtual USB Bus Error 39 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

The "Error Code 39" message ("Windows cannot load the device driver for this hardware. The driver may be corrupted or missing") typically stems from:

Security Conflicts: Windows' "Core Isolation" feature blocks older drivers that lack modern security signatures.

Registry Corruption: Corrupted UpperFilters or LowerFilters keys in the Windows Registry can prevent the USB bus from loading correctly.

Corrupt User Profiles: In some instances, crashing while multiple Mastercam sessions are open can corrupt a Windows user profile, leading to bus errors. Technical Troubleshooting Procedures 1. Disable Core Isolation (Recommended First Step) This is the most common fix for Windows 10/11 users. Open Windows Security (search via the Start menu). Navigate to Device Security > Core isolation details. Toggle Memory integrity to Off. Restart your computer. 2. Update HASP/Sentinel Drivers

Legacy drivers included with older Mastercam versions (like X7) are often incompatible with modern OS updates.

Download the latest Sentinel LDK Runtime or SafeNet HASP drivers directly from the Thales Customer Support Portal (formerly Gemalto/Aladdin). Mastercam X7-2022 Virtual Usb Bus Error 39

Ensure any previous versions are fully uninstalled via Device Manager before installing new ones. 3. Clear Registry Filters

If the driver is not loading due to internal Windows "filters," manual registry editing may be required. Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

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

Step 1: Disable Driver Signature Enforcement (Temporary)

Step 2: Uninstall via Windows Settings

Step 3: Manual Device Manager Removal

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

Step 5: Registry Cleanup

Step 6: Reboot

To avoid Error 39 when transitioning from Mastercam X7 to 2022:

Note: If these software fixes do not resolve the issue, and you are using a physical USB dongle, the dongle itself may be physically damaged. In that case, you must contact your Mastercam Reseller for a hardware replacement.

Mastercam X7-2022 : Fixing the "Virtual USB Bus Error 39" If you are seeing Error Code 39 while attempting to run Mastercam X7 Mastercam 2022 Right-click each error device → Uninstall device

, your Windows operating system is likely blocking the Virtual USB Bus driver. This error typically states that Windows cannot load the device driver because it may be corrupted or missing. In the context of Mastercam, this usually points to a conflict with modern Windows security features like Core Isolation. Top Solution: Disable Core Isolation (Memory Integrity)

The most common cause for Error 39 on Windows 10 and 11 is the Memory Integrity setting within Core Isolation. This feature can block older or virtual drivers—like the one Mastercam uses for its HASP/USB licensing—to prevent unauthorized access. To disable it: Open Windows Security via the Start menu. Navigate to Device Security on the left sidebar. Click on Core isolation details. Toggle the Memory integrity switch to Off. Restart your computer to apply the changes.

Alternative: Registry Fix for "UpperFilters" and "LowerFilters"

If disabling Memory Integrity doesn't work, corrupted registry values may be preventing the Virtual USB Bus from loading. Press Win + R, type regedit, and hit Enter.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\.

Locate the specific GUID for your USB device (look for one containing "Universal Serial Bus controllers"). On the right pane, look for UpperFilters and LowerFilters. Right-click and Delete these values. Restart your PC. Additional Troubleshooting Steps Mastercam USB HASP issue - eMastercam.com

Report: Mastercam X7-2022 Virtual USB Bus Error 39

Introduction

Mastercam X7-2022 is a popular computer-aided manufacturing (CAM) software used for machining and manufacturing processes. However, some users have reported encountering a Virtual USB Bus Error 39 when using the software. This report aims to provide an overview of the error, its possible causes, and potential solutions.

Error Description

The Virtual USB Bus Error 39 is a common error that occurs when the Mastercam X7-2022 software is unable to communicate with a virtual USB device. The error message typically appears as:

"Virtual USB Bus Error 39: The driver returned a failed result for a request to retrieve the device descriptor." The "Virtual USB Bus Error 39" in Mastercam

Possible Causes

After analyzing various user reports and forums, the following possible causes of the Virtual USB Bus Error 39 have been identified:

Solutions

To resolve the Virtual USB Bus Error 39, try the following solutions:

Conclusion

The Virtual USB Bus Error 39 in Mastercam X7-2022 can be caused by various factors, including outdated device drivers, USB port issues, software conflicts, and registry errors. By trying the solutions outlined in this report, users should be able to resolve the error and continue using the software without issues.

Recommendations

Additional Information

If none of the solutions outlined in this report resolve the issue, it is recommended to:

Mastercam Virtual USB Bus Error 39 typically occurs in Windows 10 and 11 environments because of a conflict between the virtual hardware key (HASP/dongle) drivers and modern Windows security features. This error prevents Windows from loading the necessary driver for the hardware, effectively locking users out of the Mastercam software. The Core Cause: Memory Integrity

The most frequent cause of Error 39 is a Windows security feature called Core Isolation (specifically Memory Integrity

. This feature prevents unauthorized code from accessing high-security processes but often flags the virtual USB bus drivers used by legacy or specific software versions like Mastercam X7–2022 as incompatible or "corrupted" Effective Solutions

To resolve this error and restore Mastercam functionality, users can apply the following methods: How to Fix USB Driver Error Code 39 - Matsusada Precision