If you are reading this, chances are you have just installed Mastercam 2022 (or the X7–2022 generation) on a modern Windows 10 or Windows 11 workstation, only to be greeted by the dreaded . Your NetHASP or Virtual Key has stopped working, and Mastercam refuses to launch.
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 . Why Does Error 39 Appear Specifically in 2024/2025? You might wonder: “My Mastercam 2022 worked fine last year. Why now?”
Share which step worked for you in the comments below. Keep making chips. Disclaimer: This guide is for troubleshooting legacy licensed software. Always ensure you are compliant with Mastercam’s EULA regarding virtual devices.
If you’ve followed this 2000-word guide and still see the yellow bang, your only recourse is to either downgrade to Windows 10 21H2 (and block updates permanently) or upgrade to Mastercam 2024 (which uses a newer licensing system). However, for 95% of users, the steps above will bring your CNC workstation back to life.
This article is a deep dive into why this error occurs and the exact step-by-step solution to get your Mastercam license recognized again. 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.
Error 39: "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing."
