I downloaded a custom Curtains about 7 days ago from the Stardock site. It evidently had a virus. The virus removed Mcafee. The virus also disabled my anti-virus detection, disabled Windows ability to detect if anti-virus is enabled. I separately downloaded Malwarebytes, it detected a .dll and deleted the dynamic link library and several entries. I had to uninstall the anti-virus and reinstall. When I first reinstalled Mcaffee, the antivirus was not working. So after I removed the virus with malwarebytes, I had to uninstall Mcafee, then reinstall it.

Since I had downloaded several curtains, I am not certain which one. Perhaps admin keeps a log, can check which one I last downloaded on my account. That would be the one.