Sudden loss of hard drive free space

Within a day I suddenly lost about 18GB of free space on my hard drive.  About a week ago I noticed that I had only 5% free space on my 90+GB hard drive.  I deleted, moved programs and files and finally got it up to 22%.  Then a day or so later it was down to 3%, without my doing anything unusual. I then removed more files and got it up to 6%.  But something is wrong.  I've run the degragmenter, disk cleanup, removed temp files by running %temp% and deleting the files that came up.  I have searched for all files larger than 1GB, but found nothing.  My ZoneAlarm AV and spyware scans have turned up nothing.  I haven't searched system files as I don't know how to do that.  I ran RegCure--no new space from that operation.  I'm running out of things to do short of restoring back to an earlier time using a Ghost backup on an external drive--and that's not a guaranteed cure because I am not sure when this problem started. 
I am running Windows XP Pro.  BTW, when I reboot, the free space remains about the same.

Mainefrye, welcome to the forum,
this / similar has been experienced by several members, searching for "drive space" without the "" should bring results. Here's an example with a possible solution.
Hope this helps
Edit; oops, forgot the link 
Message Edited by andyP on 01-10-2009 04:50 PM
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