I had a problem "a little" like this.
I recovered over 6G of file space (today) by finding I had lots of
stuff in Recycler folders.
Somehow, the Recycle Bin went a little crazy and got sloppy.
Stuff deleted would not be totally gone.

See: http://support.microsoft.com/kb/229041#top
"Files Are Not Deleted From Recycler Folder"

That only partly worked for me...  I could not see the stuff
they said I "should" be able to see...
I had to look at the drive with the program from:
http://windirstat.info/     (Don't sweat the "unknown" stuff,
that is a different "problem"...)

That allowed me to see the path and files I needed to.
I had  to turn off the Recycle Bin entirely while I cleaned.

Good luck...                             Rick Glazier

On Behalf Of Frausto, Richard
> Hello,I have machine with winxp,penIII,697MHz,512MB and lately I have 
> been getting a popup stating low disc space.

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