Thanks for the replies everyone.
Dias, thanks for pointing out that there is no such thing as a CD+R. I guess I'm so used to the deal with DVD+Rs and DVD-Rs that I forgot.
Anyway, it is not a bad burn. Like I said, it works in other computers. There is nothing faulty about the disc or the drive.
truenorth, you're probably right. There's a good chance the technology is just too old and I'm not going to get it to work. I beleve it has 768MB of RAM, but it's not with me at the moment so I can't verify that. It should at least run 7, but probably not well. I've installed 7 on my modern computers, but I just thought it'd be interesting to try it on this thing.
Rob, it is an IDE drive. I have a USB enclosure for it, but the BIOS doesn't seem to support booting from USB either.
Oh well. It was worth a shot. Thanks for the help, everyone.