Mastercam+x72022+virtual+usb+bus+error+39+fixed

While there isn't a single formal academic "paper" on this specific error, the Virtual USB Bus Error 39 in Mastercam (often occurring in versions like X7 through 2022) is a well-documented driver signature and registry issue. It typically happens when the operating system (usually Windows 10 or 11) blocks the virtual USB emulator driver because it lacks a valid digital signature or has corrupted registry entries. Understanding the "Error 39"

The Windows Device Manager reports Error 39 when it "cannot load the device driver for this hardware... the driver may be corrupted or missing." In the context of Mastercam emulators, this usually means Core Isolation or Windows Driver Signature Enforcement is blocking the unsigned virtual bus. Step-by-Step Fixes

Based on common technical resolutions, here is how this is typically fixed:

Disable Memory Integrity (Core Isolation): This is the most common culprit in newer Windows versions.

Go to Windows Security > Device Security > Core isolation details. Toggle Memory integrity to Off. Restart your computer.

Disable Driver Signature Enforcement: If the driver is unsigned, Windows will block it by default. Hold Shift while clicking Restart.

Navigate to Troubleshoot > Advanced options > Startup Settings > Restart. Press 7 or F7 to "Disable driver signature enforcement." Registry UpperFilters/LowerFilters Removal:

Open regedit and navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000. Look for UpperFilters or LowerFilters in the right pane.

Delete these entries and restart. (Warning: Back up your registry first).

Update the Virtual Bus Driver: Manually point the Device Manager to the mcamusb.inf file found within your Mastercam installation directory or the specific emulator folder to "Update Driver." Community Insights

Technical users often find that Windows updates silently re-enable security features that break these virtual drivers.

"The issue is almost always Windows 10/11 security. If you don't turn off Memory Integrity in the Windows Defender settings, the virtual bus will never start, no matter how many times you reinstall it."

"Check your Device Manager. If you see the yellow triangle with Error 39, it's a signature issue. Disabling driver enforcement during boot usually clears it right up."

Fixing the Mastercam X7 to 2022 Virtual USB Bus Error 39 typically requires disabling the Windows Core Isolation (Memory Integrity) security feature, which often blocks the specialized drivers used for HASP keys or virtual USB emulators. Direct Solutions for Error 39 1. Disable Core Isolation (Recommended)

This is the most frequent fix for modern Windows 10 and 11 systems where security features prevent the Virtual USB Bus driver from loading.

For Windows 11: Go to Settings > Privacy & security > Windows Security > Device security.

For Windows 10: Go to Settings > Update & Security > Windows Security > Device Security.

Click Core isolation details and toggle Memory integrity to Off. Restart your computer for changes to take effect. 2. Clean Driver Reinstallation

If disabling security doesn't work, the driver files may be corrupted. Open Device Manager (Win + X). Expand Universal Serial Bus controllers.

Right-click the "Virtual USB Bus" or "HASP" device with the yellow exclamation mark and select Uninstall device. mastercam+x72022+virtual+usb+bus+error+39+fixed

Check the box for Delete the driver software for this device.

Download and install the latest HASP drivers from official support sites like Thales Customer Support. 3. Registry Editor Fix (UpperFilters/LowerFilters)

If the system still fails to load the driver, you may need to clear corrupted filter entries in the registry. Press Win + R, type regedit, and press Enter.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36fc9e60-c465-11cf-8056-444553540000 (This is the class for USB controllers).

In the right pane, look for UpperFilters or LowerFilters and Delete them. Restart your computer. Troubleshooting Additional Causes Mastercam USB HASP issue - eMastercam.com

Mastercam Version-Specific Notes

| 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) |

Mastercam X7-2022 “Virtual USB Bus Error 39”: The Definitive Fix Guide

Published by: CAD/CAM Troubleshooting Lab
Target Software: Mastercam X7, X8, X9, 2017, 2018, 2019, 2020, 2021, 2022
Error Code: Code 39 (Windows Device Manager – Virtual USB Bus Driver)

Phase 3: Reinstall the Correct Virtual Bus Driver

Do not rely on Mastercam’s default installer—it often bundles the broken driver.

  1. Download the Sentinel HASP/LDK driver from Thales (formerly SafeNet). Look for version 8.31 or higher.
  2. Run the haspdinst.exe -install command from an admin command prompt: 
    cd C:\Program Files (x86)\Common Files\Aladdin Shared\HASP
haspdinst.exe -remove
haspdinst.exe -install
  3. Download the standalone Virtual USB Bus driver (search for vusbbus.inf for Mastercam 2022).
  4. Right-click the .inf file → Install.

Symptoms of the Error

  • Mastercam splash screen appears, then disappears.
  • Device Manager > System devices > Virtual USB Bus shows a yellow exclamation mark.
  • Device status reads: "Windows cannot load the device driver... Code 39"
  • The Virtual HASP (Sentinel) tool shows no license found.

Conclusion: Error 39 is Stubborn, But Not Invincible

The Mastercam Virtual USB Bus Error 39 has frustrated machinists and programmers for nearly a decade. However, as we have demonstrated, the error is almost always repairable without reinstalling Windows or buying a new PC.

To recap your battle plan:

  1. Disable Secure Boot & Core Isolation (fastest win).
  2. Purge Upper/Lower Filters from Registry (targets the core cause).
  3. Disable Driver Signature Enforcement (essential for Windows 10/11).
  4. Manually replace vusbbus.sys (bypasses corruption).
  5. Last resort: hasphl.exe nuclear cleanup.

After applying these steps, Mastercam X7 through 2022 will finally recognize the Virtual USB Bus, Error 39 will vanish, and your CAD/CAM workflow can resume.

If you are still stuck, post your Windows build number (run winver) and the exact text of the error in the comments below. The community has solved hundreds of these cases—yours will be next.

Disclaimer: This article is for educational and troubleshooting purposes only. Unauthorized use of cracked software or circumvention of licensing mechanisms is illegal. Always use legitimate Mastercam licenses provided by a certified reseller.

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)

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 While there isn't a single formal academic "paper"

Introduction

Mastercam X7 2022 is a popular computer-aided manufacturing (CAM) software used for CNC machining. However, some users have reported encountering a "Virtual USB Bus Error 39" issue while trying to use the software. This error can be frustrating and prevent you from using the software effectively. In this guide, we will walk you through the steps to fix this error.

What is Virtual USB Bus Error 39?

The Virtual USB Bus Error 39 is a common error that occurs when the Mastercam X7 2022 software is unable to communicate with the USB dongle (also known as a hardware key or license key). The dongle is a small device that plugs into your computer's USB port and is used to authenticate the software license.

Causes of Virtual USB Bus Error 39

The error can be caused by a variety of factors, including:

  1. Faulty USB dongle: The dongle may be damaged or malfunctioning.
  2. USB port issues: The USB port may be faulty or not functioning correctly.
  3. Driver problems: Outdated or corrupted drivers may be preventing the software from communicating with the dongle.
  4. Conflicting software: Other software may be interfering with the Mastercam X7 2022 software.
  5. Windows registry issues: Registry entries may be corrupted or incorrect.

Step-by-Step Solution

To fix the Virtual USB Bus Error 39, follow these steps:

Step 1: Troubleshoot the USB Dongle

  1. Try using a different USB port on your computer.
  2. Check the dongle for physical damage.
  3. If possible, try using a different dongle.

Step 2: Update Drivers

  1. Go to the Device Manager (Windows key + X and select Device Manager).
  2. Expand the "Universal Serial Bus controllers" section.
  3. Right-click on each USB Root Hub and select "Update driver".
  4. Follow the prompts to search for and install updated drivers.

Step 3: Disable Conflicting Software

  1. Close all unnecessary programs and background applications.
  2. Check for any antivirus software that may be interfering with the Mastercam X7 2022 software.
  3. Temporarily disable any firewall or antivirus software.

Step 4: Clean the Windows Registry

  1. Open the Registry Editor (Windows key + R, type "regedit", and press Enter).
  2. Navigate to the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceClasses\a45c254e-df1c-4efd-8020-67d146a850e0\####\Device Parameters
  3. Look for any entries with a " USB" or "Virtual" keyword.
  4. Delete any entries that seem suspicious or unnecessary.

Step 5: Reinstall Mastercam X7 2022

  1. Uninstall the Mastercam X7 2022 software.
  2. Reinstall the software from the original installation media or download.

Step 6: Apply the Fix

  1. Download and install the Mastercam X7 2022 patch from the official CNC Software website.
  2. Follow the prompts to apply the patch.

Verification

After completing these steps, start Mastercam X7 2022 and verify that the Virtual USB Bus Error 39 is resolved. If you still encounter the error, you may want to contact CNC Software support or a qualified technical support specialist for further assistance.

Conclusion

The "Error Code 39" in Mastercam (typically related to the Virtual USB MultiKey or HASP drivers) usually indicates that Windows cannot load the device driver because it is either corrupted, missing, or blocked by security features. This is a common issue on Windows 10 and 11 due to enhanced security protocols like Memory Integrity. Core Solutions to Fix Error 39

The most effective fix for this specific Mastercam error involves adjusting Windows security settings or cleaning up registry filters. 1. Disable Core Isolation (Memory Integrity) Mastercam Version-Specific Notes | Mastercam Version | Known

This is the most frequent cause for Virtual USB drivers failing to load. Windows security blocks drivers it deems "incompatible" with memory protection. Open the Start menu and search for Windows Security. Navigate to Device security > Core isolation details. Toggle Memory integrity to Off. Restart your PC for the changes to take effect. 2. Delete Upper/Lower Filters in Registry

If the driver itself is corrupted, Windows may have "stuck" filters in the registry preventing proper communication.

Press Win + R, type regedit, and hit Enter to open the Registry Editor.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36fc9e60-c465-11cf-8056-444553540000 (This is the standard class for USB controllers).

In the right pane, look for UpperFilters and LowerFilters. If they exist, right-click and Delete them. Restart your computer. 3. Reinstall Virtual USB / HASP Drivers How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial]

In Mastercam (X7 through 2022 versions), Virtual USB Bus Error 39

is a common driver-related issue that prevents the software from verifying its hardware security key (HASP)

. This error typically indicates that Windows cannot load the device driver because it is either corrupted, missing, or blocked by modern security features. Core Causes Core Isolation (Memory Integrity):

This is the most frequent cause on Windows 10 and 11. This security feature blocks older drivers that don't meet modern memory safety standards. Corrupt Registry Entries:

Invalid "UpperFilters" or "LowerFilters" in the Windows Registry can prevent the USB bus from communicating with the driver. Driver Incompatibility:

Legacy Mastercam versions (like X7) use older Virtual USB MultiKey drivers that are often flagged as unsigned or incompatible by newer Windows updates. Step-by-Step Fixes 1. Disable Core Isolation (Most Effective)

Since many Mastercam drivers are older, disabling this Windows security feature often resolves the block immediately. Windows Security via the Start menu. Navigate to Device security Core isolation details Memory integrity your computer for changes to take effect. 2. Modify the Windows Registry

If disabling Core Isolation fails, you may need to clear corrupted filter entries. Back up your registry before proceeding. , and run as Administrator. Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\ Locate the USB class folder: 36FC9E60-C465-11CF-8056-444553540000 In the right pane, find UpperFilters , right-click it, and select 3. Reinstall Virtual USB MultiKey Drivers

For older Mastercam versions (X7–X9), the virtual bus itself may need a "clean" reinstallation. Device Manager

and find the "Virtual USB MultiKey" with the yellow exclamation mark. Right-click and select Uninstall device remove.bat

(or similar) file from your Mastercam installation folder to clear old driver fragments. install.bat

as an Administrator to reinstall the updated 64-bit drivers. Advanced Troubleshooting

If the steps above do not work, consider these alternative solutions reported by the community: Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups 24 Jul 2024 —

Here’s the long-story-short version of how the Mastercam X7 + Windows 10/11 + Virtual USB Bus error 39 typically gets fixed — because that error has ruined many a Monday morning.

What is the Mastercam Virtual USB Bus?

To understand Error 39, you must first understand how Mastercam’s licensing works. For decades, Mastercam used a physical "HASP" (dongle) that plugged into a USB port. However, many users (especially with educational or certain licensed versions) use a Virtual USB Bus—a software-emulated USB device that mimics the hardware dongle.

The vusbbus.sys driver creates a phantom USB controller inside Windows. When you install Mastercam X7 through 2022, this driver is installed alongside the software. On modern systems with Secure Boot, Driver Signature Enforcement, or recent Windows 11 updates, this old driver gets flagged, corrupted, or blocked—leading straight to Code 39.