Do you mean you have only 762 MB of a drive capable of 68.2 GB? That would be low. If you have only 762 MB used, I'd wonder what OS you are running. It would need to be before XP if you're running Windows.
how do i find out what is causing my C drive to fill up? Has 762 MB of 68.2 GB and I keep getting a message I'm running out of space. I don't see any large files. How do I tell which extensions are ok to delete?

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