Mastercam+x72022+virtual+usb+bus+error+39+fixed ((full)) Jun 2026

After the Windows 11 update (or a Windows 10 22H2 cumulative update), Microsoft tightened driver signature enforcement and changed how USBHUB.SYS and Winusb.sys interact with virtual root hubs. The HASP driver—signed with a SHA-1 certificate from 2012—was now considered "untrustworthy."

that often blocks virtual USB drivers used by older software emulators. Start Menu and search for Windows Security Navigate to Device security Core isolation details Toggle the Memory integrity your computer. Secondary Fix: Registry Filter Deletion

The fix lasted 14 months until a Windows security update rewrote the USB class driver again. By then, Marcus had finally migrated to Mastercam 2024, but he kept an air-gapped Windows 10 LTSC machine with the hacked driver—just in case.

If this key exists, delete the entire vusbbus key. mastercam+x72022+virtual+usb+bus+error+39+fixed

After 14 hours of forum-diving, Marcus found a cryptic post on a Russian CNC forum (translated):

Navigate to:

Launch . If the software opens without a "No Mastercam license found" or "Sim not found" prompt, the communication bridge between the emulator and the software is restored. After the Windows 11 update (or a Windows

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 callback that the legacy driver didn’t implement. The bus initialized, but the PnP manager marked it as "failed to start."

Permits Windows to run specialized virtual bus drivers smoothly.

Remove the old driver by typing: haspdinst.exe -purge or haspdinst.exe -r . Install the fresh driver by typing: haspdinst.exe -i . Secondary Fix: Registry Filter Deletion The fix lasted

, find the Virtual USB Bus with the yellow exclamation mark, right-click, and select Uninstall device

If you want to continue troubleshooting your software setup, tell me:

Windows requires all drivers to be digitally signed. Virtual USB bus drivers used for Mastercam often fail this check, leading to Code 39. Click Start > Settings > Update & Security > Recovery . Under Advanced startup , click Restart now .

| 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) |