my hard drives are practically full well my c drive has 150 gb left of 221 nd my drive has 133 MB left of 11.6 gb. and i recently changed my systems from windows vista premimum to vista business and i dont have the product key for business , im basically screwed if i dont get it fixed. why cant i format my hard drives? when i try to do tht 2 my c drive it dsnt let me it says it would affect the computer, and my d drive keeps on eating up space even though i dont have many things installed. its like there is something taking up soo much space tht my new programs dont have any and its really hard for me to use it. can anyone please tell me how can i clear my drives and should i get the product key or there is ANYTHING i can do to save my laptop? please and thank you