It sounds like the Windows page swap file. If you have a free space on the D drive you can move it there. Right click on My computer and choose Properties. Click on Performance Tab than Virtual Memory button. Here you can change the location the swap file. The computer'll reboot after that.
You can allso speed up yor PC by using following tip http://www.pcmag.com/article/0,2997,s%253D1518%2526a%253D4025,00.asp

>I can't afford one right now. In the meantime, I wonder if anyone has any insight into this situation.
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>W95, hard drive is separated into 2 logical disks. After I'm working awhile, w/a number of apps open (Outlook Express, Palm Desktop, VFP, Word, Hackers, Excel, UT), it looks like there is only 75 MB free space left on my C: drive; 300 MB on D:
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>The size of files in C:\Windows\temp seems negligible.
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>Close all apps...not much change, after "Close all programs and log on as different user" no change. but after a full shut down and restart the computer, drive C: now has a whopping 153 MB. I'd LIKE to retrieve this space w/out re-booing....
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>Any ideas why this is happening, or what I can do about it?
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>TIA J