It’s back and running properly, and I’ve even decided to make it a dual-boot machine. I usually use Linux, but I am occasionally needing to deal with Vista at work more and more, so I reinstalled Vista onto the thing. Second partition, and not in use as primary.
But it’s there for when I need to do something in Windows proper. Installed the Service Pack as well.
Just need to find out how to disable the automatic reporting of everything back to Microsoft.