Mastercam X7-2022 virtual USB bus error 39 typically occurs when Windows prevents a third-party driver from loading due to modern security features or registry corruption. This error is often associated with "MultiKey" or Aladdin HASP drivers used for software licensing. Primary Fix: Disable Core Isolation (Memory Integrity) The most common cause for Error 39 on Windows 10 and 11 is Memory Integrity
, a security feature that blocks drivers it deems incompatible. Matsusada Precision Windows Settings and navigate to Privacy & security (Win 11) or Update & Security Windows Security Device security Core isolation details Memory integrity Restart your computer for the changes to take effect. Alternative Fix: Registry Editor (Lower/Upper Filters)
If disabling security features does not work, corrupted registry values may be blocking the USB bus. , and press Enter. Navigate to the following path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\ Locate the specific folder for USB Controllers: 36FC9E60-C465-11CF-8056-444553540000 In the right-hand pane, look for UpperFilters LowerFilters Right-click and these values. Restart your PC Driver Specifics for Virtual USB Bus How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial]
The "Virtual USB Bus Error 39" in Mastercam X7 through 2022 is intimidating but highly fixable. The root cause is almost always a registry filter conflict or corrupted driver cache.
Quick Recap:
.sys files from System32\drivers.After following this guide, you should see your Virtual USB Bus functioning correctly, and Mastercam will launch without license errors.
Still stuck? Contact your Mastercam Reseller with the following info: Windows version (e.g., Win11 22H2), Mastercam build number, and a screenshot of Device Manager showing Code 39. They can provide version-specific hotfixes.
Happy machining.
The "Error Code 39" for the Mastercam Virtual USB Bus typically occurs because Windows security features, specifically Core Isolation, block the driver from loading. This error indicates that the driver is corrupted, missing, or more commonly in recent Windows versions, incompatible with modern memory protection. Primary Fix: Disable Core Isolation (Memory Integrity)
Most modern Windows 10 and 11 systems block older or unsigned drivers via a feature called Memory Integrity. Open Windows Security from the Start menu. Navigate to Device security > Core isolation details. Toggle Memory integrity to Off. Restart your computer for the change to take effect. Secondary Fix: Registry Edit (DeviceGuard)
If you cannot toggle Memory Integrity in settings, you can force it off via the Windows Registry Editor:
Search for regedit in the Start menu and run as administrator.
Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity. Set the Enabled value to 0. Restart your system. Additional Troubleshooting Steps Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups mastercam x72022 virtual usb bus error 39 fix
To fix the Virtual USB Bus Error 39 in Mastercam (X7 through 2022 versions), you typically need to
address driver integrity issues caused by Windows security features or corrupted registry entries
The most common solution for modern Windows systems (10/11) is disabling Memory Integrity
, which often blocks virtual USB drivers used for licensing. Matsusada Precision 1. Disable Core Isolation (Memory Integrity)
Windows security can block the virtual driver from loading, resulting in Error 39. Windows Security (search for it in the Start menu). Device security Core isolation details Memory integrity
your computer and check the Device Manager to see if the error is gone. 2. Remove "UpperFilters" and "LowerFilters" in Registry
If disabling security doesn't work, corrupted registry values may be preventing the driver from loading. , and press Enter. Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\ Find the folder: 36FC9E60-C465-11CF-8056-444553540000 In the right pane, look for UpperFilters LowerFilters . Right-click and your computer. 3. Reinstall HASP Drivers
Corrupted drivers are a frequent cause. A clean reinstall is often necessary. How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial]
Troubleshooting Mastercam X7 2022: Virtual USB Bus Error 39 Fix
Mastercam X7 2022 is a popular computer-aided manufacturing (CAM) software used by machinists and manufacturers worldwide. However, some users have reported encountering a frustrating error known as the "Virtual USB Bus Error 39" when attempting to run the software. In this article, we'll delve into the causes of this error and provide a step-by-step guide on how to fix it.
What is Error 39 in Mastercam X7 2022?
Error 39 in Mastercam X7 2022 is a virtual USB bus error that occurs when the software is unable to communicate with a virtual USB device. This error typically manifests as a pop-up message stating, "Virtual USB Bus Error 39: The driver for this device could not be loaded." Mastercam X7-2022 virtual USB bus error 39 typically
Causes of Virtual USB Bus Error 39
After investigating various user reports and forums, we've identified several potential causes of the Virtual USB Bus Error 39 in Mastercam X7 2022:
Fixing Virtual USB Bus Error 39 in Mastercam X7 2022
To resolve Error 39, try the following troubleshooting steps:
The Mastercam Virtual USB Bus Error 39 is a driver signature and registry corruption issue, not a hardware failure. In 90% of cases, Fix 2 (Manual Reinstall) combined with Fix 3 (Registry Cleanup) resolves the error within 15 minutes.
For Windows 11 users, Fix 1 (Disable Signature Enforcement) or Fix 7 (Test Mode) are essential. And if you’re running Mastercam X7 on modern hardware, seriously consider upgrading – CNC Software ended support for X7 in 2016, and the driver headaches will only intensify.
If you’ve tried all 10 fixes and still see Error 39, post your Device Manager hardware IDs (right-click device → Properties → Details → Hardware Ids) to the Mastercam Forum – the community has seen every variation of this bug.
Good luck, and happy toolpathing.
The Mastercam virtual USB bus error (Code 39) typically occurs because Windows security features or corrupted registry entries prevent the virtual driver from loading. 1. Disable Core Isolation (Memory Integrity)
Modern Windows security often blocks virtual USB drivers like those used by Mastercam. Disabling this feature is the most common fix. menu and search for Windows Security Device security Core isolation details Memory integrity
your computer and check if the driver loads in Device Manager. Matsusada Precision 2. Remove Corrupted Registry Filters
Corrupted "UpperFilters" or "LowerFilters" can block USB device drivers from starting. , and press Navigate to: Conclusion: You Can Fix Error 39 The "Virtual
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 if they exist. your computer. 3. Disable Virtualization-Based Security (Registry)
If you cannot toggle Core Isolation via settings, you can force it off in the registry. Microsoft Learn Registry Editor
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity Microsoft Learn 4. Reinstall Virtual USB Drivers
If the error persists, the driver files themselves may be corrupted. Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups 24 Jul 2024 —
To fix the Virtual USB Bus Error 39 for Mastercam (versions X7 through 2022), you typically need to address security features in modern Windows versions that block certain virtual drivers. This error indicates that Windows cannot load the device driver because it is either corrupted, missing, or blocked. Primary Fix: Disable Core Isolation (Memory Integrity)
The most common cause for Error 39 on Windows 10 and 11 is the Core Isolation security feature, which prevents many virtual USB drivers from loading. Open the Start menu and search for Windows Security. Navigate to Device security on the left-hand sidebar. Under Core isolation, click on Core isolation details. Switch the Memory integrity toggle to Off. Restart your computer for the changes to take effect. Secondary Fix: Registry Editor (Remove Filters)
If disabling Core Isolation doesn't work, corrupted registry "filters" might be blocking the driver. Press Windows + R, type regedit, and hit Enter.
Navigate to the following path:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000
In the right pane, look for entries named UpperFilters and LowerFilters. Right-click and Delete both (if they exist). Restart your PC. Alternative Troubleshooting Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups
A “USB Bus Error 39” in Mastercam X7 (or any software using a virtual USB dongle, like the 2022 version of the HASP/SafeNet emulator) usually means Windows cannot load the virtual device driver because its registry entries are corrupted or another driver is conflicting.
Here’s a focused review of the problem and the most reliable fix:
This error became widespread for three main reasons:
Haspnt.sys or hardlock.sys files that the Virtual USB Bus depends on.Important Distinction:
- Error 39 (Virtual USB Bus) → Problem with the driver itself or its registry keys.
- Error 10 (Device cannot start) → Usually a USB port power or physical HASP issue.
- No error, but Mastercam says "No License Found" → HASP driver is working, but the license file is missing.