I decided to do some spring cleaning on my laptop, and used a disk analyzer to free up some space on my C drive. I've managed to go from about 13 to about 33 GB of space, but I noticed that I was only using about 50 GB, and about 60 GB of my 140 GB hard drive was completely unaccounted for. Based on what I've learned from some research, a likely candidate might be my Windows XP's System Restore Points, but I've checked my System Restore settings and it's only supposed to use 12% of disk space, which should be around 17 GB.
I've got 30 GB of free space and a 500 GB external hard drive, so I'm not especially worried, but I'm curious as to what's taking up so much space on my computer. If it's important system processes, I don't mind leaving them be. But if there's anything I can do about it, I'd like to know.