Boot from the Windows cd (I presume it's 2000 or XP) It'll automatically start the setup. Choose 'New Install' (or something similar) and when it asks about partitions, simply delete the C-partition (which you have to confirm about two or three times) and re-create it afterwards. It'll ask wether you want to format it and off course you say 'yes' (and select NTFS). After that you've got a completely clean C: with nothing on it but your OS. Good luck.
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