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I guess you have changed your "folder" options so you can view hidden/system files?
Did you try the disk clean up thing for system logs etc, although I this will remove your windows.old folder.....
Hey reece86... the reason its so full, is because your previous install was saved to c:/windows.old... it is probably 15-20gb depending on how many apps you have installed... browse that folder for anything you may want to keep, then delete it...
Good Luck...
there wouldn't be anything important on there would there be?