Restore it to the factory condition (you'll only lose what you don't backup on other machines or external drives.)
I like Kees's first answer better.
have a pavilion elite using vista i went to download and think i clicked wrong drive for backup my d drive went from 6gb to about 9.5 gb of a 11.3 gb drive and now i can't get any downloads ie especially are any updates cause my d drive is almost full.is there a way to get d drive back to original 6gb???i looked at my d drive for duplicate files and it has a heck of alot of them but i don't which ones to erase.plrease help!!!hp pavilion elite f using vista,d-drive is 11.3 gb drive but now almost full with duplicats files so now using 9.5 gb.