Hope me: Stupid, simple 'puter question... →[More:]

Bullet-pointed to be brief as possible:

*So, a friend of mine cobbled together my PC years ago out of pieces-parts at a trade show. I never paid much attention to what he did.

*Lately I get this error message often:

Low Disk Space

You are running very low on disk space on Local Disk (D:).
To free space on this drive by deleting old or unnecessary
files, click here...

*So I wonder how I could be so low and I look at My Computer and see THIS which indicates I have two Local Drives.

*(D:) says it has 37.2 GB used and 64 KB free. Can that be right!? Naw... (C:) says it has 4.48 MBs used and 3.36 MB free.

*Sure, I have Corell Draw, PhotoShop and PaintShop, but otherwise I don't have much in the way of programs. I have hundreds of large image files, though. No, they're not pron MPEGs & JPGs, just photos and art.

*Does it seem like I should be so low on space? Do you think I should make due for now with moving my docs to a cheap external drive that would also serve as a backup? I hate to spend $$ adding RAM to an old 'puter. Is my computer wonky?

Thanks...