So, I was apparently wrong in my assumption that when I told Debian 4.0 (a Linux distribution) to install on the 20 gigs of unpartitioned space I had for it, it wouldn't touch the other partition with a vast majority of all my stuff on it. At least, that's what Windows 2000 said happened when I popped in its install CD it see what went wrong. The drive still shows up as a disk in Windows, but it claims it isn't formatted. Doesn't list the capacity, either. Linux's install partition is absent,as I think it uses a different file system.
Now, I still have my 40-gig C-drive, but all my games and most of my other files were on the larger one. Do you know of ANY way to repair a drive without reformatting? Because, you know, I REALLY need it. Desperately. Like, I've got several months worth of work in Photoshop and 3DS Max on there that I don't want to disappear.