i was wondering, if i takr out my hdd and replace it with a new one on a laptop, how will i re-install my OS? i am not worried about my programs *( i have nothing worth keeping )* Is it safe just to replace it? will teh pc be like new? can i use the same LEGIT install key? since this is the same pc. and can i put in SSD? Now,anything i should be worried about? or carefull apon?