Well, it quit on me during the first phase, copying files. When I cancelled the upgrade process, it said nothing had been changed on my system, so I think it should be fine. I really want to avoid doing a clean install if it's possible. So, I'll try to do the standing upgrade again with a good disk first.
I got Dell to overnight me a new disk for free, but they sent me a 64bit version instead of 32, and I know for a fact my drivers are not all going to be happy with that. After spending 20 minutes convincing a Dell tech that 64 is different and not necessarily better, they finally have agreed to ship me the right one.
Should be here by Monday.