There are two main methods to resolve this, depending on your Windows version (Windows 7 vs. Windows 10/11).
If Method 1 did not work, the driver is likely being blocked by Windows because it lacks a valid digital signature (common with older emulator drivers).
Important Disclaimer: Using "virtual USB" drivers or emulators to bypass hardware keys (HASP/Sentinel) typically involves using pirated software. This is illegal in most jurisdictions and poses significant security risks, as these drivers often modify system kernel files. If you are using Mastercam for professional or educational purposes, it is highly recommended to purchase a legitimate license from the official Mastercam website or an authorized reseller to avoid system instability and legal issues.
Fixing the "Virtual USB Bus Error 39" in Mastercam (X7 through 2022) usually comes down to resolving a conflict between older drivers and modern Windows security features like Core Isolation. Fixing Mastercam Virtual USB Bus Error 39
If you're seeing "Windows cannot load the device driver for this hardware... (Code 39)" in your Device Manager, try these steps to get back to work: 1. Disable Memory Integrity (Core Isolation)
The most common cause for Error 39 on Windows 10 and 11 is a security feature that blocks drivers it doesn't recognize as modern or secure. Open Windows Security from your Start menu. Go to Device security > Core isolation details. Toggle Memory integrity to Off.
Restart your computer. This often immediately solves the issue by allowing the virtual driver to load. 2. Delete Corrupted Registry Filters
Sometimes, "UpperFilters" or "LowerFilters" in the Windows Registry become corrupted and prevent USB drivers from loading correctly. Press Win + R, type regedit, and hit Enter.
Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000.
On the right side, find UpperFilters or LowerFilters. Right-click and Delete them. Restart your PC to let Windows rebuild these keys. 3. Clean Reinstall of USB Controllers
If the registry fix doesn't work, try a full reset of your USB stack. Open Device Manager (devmgmt.msc). Expand Universal Serial Bus controllers.
Right-click and Uninstall every device listed (excluding Root Hubs if you're using a USB mouse/keyboard).
Restart your computer; Windows will automatically reinstall the drivers upon reboot. 4. Update HASP/Sentinel Drivers
For Mastercam versions like X7 up to 2022, ensuring you have the latest Sentinel HASP LDK drivers from the official Thales/SafeNet support site can resolve compatibility issues that older virtual keys might trigger. Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups
The "Code 39" error for the Mastercam Virtual USB Bus (often associated with MultiKey or HASP emulators) typically indicates that Windows cannot load the driver because it is either corrupted, missing, or blocked by security features. This issue is common in Windows 10 and 11 environments due to increased security around unsigned or third-party drivers. Primary Cause: Core Isolation (Memory Integrity) mastercam+x72022+virtual+usb+bus+error+39+fixed
The most frequent cause of Code 39 for virtual drivers in modern Windows is Core Isolation , specifically the Memory Integrity
setting. This feature prevents drivers that do not meet strict security standards from loading. Matsusada Precision How to Fix Windows Security from the Start menu. Navigate to Device Security Core isolation details Memory integrity Restart your computer to apply the changes. Matsusada Precision Alternative Solution: Registry Modification
If the error persists or you cannot access security settings, you can manually disable the integrity check via the Registry Editor. Registry Path
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity : Find the value and set it to Legacy Fix : Some users resolve Code 39 by deleting UpperFilters LowerFilters
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000 if they exist. Driver Reinstallation Steps
Mastercam users transitioning from older versions like X7 to modern releases like 2022 often encounter the frustrating "Virtual USB Bus Error 39". This error typically presents as a yellow exclamation mark in the Device Manager next to the "Virtual USB MultiKey" or "Sentinel" driver, preventing the software from detecting the necessary security dongle.
The core issue is that Windows 10 and 11 have stricter security protocols—specifically Core Isolation (Memory Integrity) and Driver Signature Enforcement—which block older virtual USB bus drivers from loading.
Here is the comprehensive guide to fixing Mastercam Virtual USB Bus Error 39. Phase 1: Disable Windows Core Isolation (Primary Fix)
Modern Windows security features can block third-party virtual drivers. This is the most common cause of Error 39.
Open Windows Security: Click the Start menu, type "Windows Security," and open it.
Navigate to Device Security: Select Device security on the left sidebar. Core Isolation Details: Click on Core isolation details.
Toggle Memory Integrity Off: Find the "Memory integrity" switch and turn it Off.
Restart Your PC: You must restart your computer for these changes to take effect. Phase 2: Disable Driver Signature Enforcement
If the error persists after disabling Core Isolation, Windows may still be blocking the driver because it isn't digitally signed for the current OS version. Hold the Shift key and click Restart from the Start menu. There are two main methods to resolve this,
Go to Troubleshoot > Advanced options > Startup Settings > Restart.
After the PC restarts, press 7 or F7 to select "Disable driver signature enforcement".
Once Windows boots, check the Device Manager to see if the Virtual USB Bus is now active. Phase 3: Registry Editor Fix (Removing UpperFilters)
Corrupted registry entries can prevent the USB bus driver from initializing correctly. How to Fix USB Driver Error Code 39 - Matsusada Precision
This text appears to be a search query or a file name, likely related to software troubleshooting or piracy. It suggests a user is looking for a solution to a specific technical error within the Mastercam X7 2022 software.
Here is a breakdown of the components:
Context: The combination of these terms strongly suggests this is related to cracked software. Legitimate users experiencing a driver error would usually contact the software vendor (CNC Software) or reinstall the official dongle drivers (like the Sentinel Driver). The search for a "fixed" file usually implies bypassing the security check that is causing the virtual bus error.
Safety Warning: If you found a file with this name or are considering downloading a "fix" for this error:
If the above fails, the driver’s upper/lower filters are corrupted.
Warning: Backup your registry first.
After reboot, the system recreates clean filters. Reinstall the Virtual USB Bus driver from Phase 3.
Important: Back up system restore point and export registry keys you modify.
A. Restart and simple checks
B. Reinstall/repair license drivers (Vendor-specific) Context: The combination of these terms strongly suggests
Examples:
C. Remove corrupted drivers and reinstall
D. Repair Windows driver store and system files
E. Check and clean registry filter drivers (UpperFilters/LowerFilters)
F. Reinstall Mastercam license components
G. Check services and permissions
H. Antivirus/Driver signature enforcement
I. If driver files exist but get blocked by Windows driver store corruption
J. Reinstallation of Windows USB Controller drivers
K. Last resorts
The standard playbook failed:
The deeper issue: The HASP driver’s internal DriverEntry routine called IoCreateDevice() for the virtual USB bus, but Windows 11’s new USB stack (introduced in insider builds and backported to 22H2) required a BusRelations callback that the legacy driver didn’t implement. The bus initialized, but the PnP manager marked it as "failed to start."
| Mastercam Version | Known Issue with Error 39 | Best Fix | |-------------------|---------------------------|-----------| | X7 (2013) | Windows 10 20H2+ blocks driver | Step 4 (Test Mode) + Step 3 (Registry) | | X9 (2015) | Driver signing expiry | Step 5 (Replace vusbbus.sys) | | 2018 | Conflict with USB 3.0 controllers | Step 2 + Disable xHCI in BIOS | | 2020 | Memory Integrity blocks | Step 1 (Core Isolation OFF) | | 2022 | Windows 11 native incompatibility | Step 6 (Hardware ID injection) |
If you just need the software to boot once: