I've tried running anti-virus software, and I ran CCleaner, and I now how 6 gigs. I also located a number of suspicously named files that were all 25,600 kb and were all created on the same day. I deleted them, but i'm still not back up to where I was in terms of space. But I guess for now this will work. I'll probably back up my programs and files at some point and do a fresh install.
Thanks for all the help!