Somethings not right here. You should have at least a gig of free space in your partition. Is your partition about 5 gig? Windows does not take up all that space. Maybe I'm thinking of your recovery space here, when in fact your talking about C drive.
The best I can suggest, is to go into your performance and maintenance menu and run a scan on your hard-drive, to see what space you can free up, by compressing older files and defragging your drive.
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