I just want to let you know that the link that audioboy provided to free up space on my hard drive was supergood. It must have cleaned up between 800 MB of files - maybe more than a Gig, I forget. But my system was down on resources, and it really slimmed down a bunch of files I didn't need.
The computer works fine now. Thanks for the post, audioboy, and Samm, thanks for linking the forum post in your email.