I have Norton System Doctor, so I can easily monitor the free space on Drive C. It varies each time the computer is started from a low around 350MB to a high of over 500MB. The free space shown in Windows Explorer is always the same as that shown in System Doctor. That is, it also varies.
Disk cache, temorary internet files, Internet history, files that system doctor keeps monitoring your PC....tons of things cause it to fluctuate. What OS are you using?
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