Operating System

Hello,

i bought a Compaq Presario CQ60-104TU Notebook PC, and dealer uploaded the pirated version of vista,
and now it is asking for product key..

i want to downgrade my OS from vista to XP,

Can i do That??

if not,, what to do??

if i have to upload with original vista , will my backup will be available after boot ???
(does only C drive will format??)

after booting where to get Drivers?? and how to get Drivers???

Before booting What necessary step should i take??

please help me out of this counterfieghting problem...

will Crack version of others software like,
(staad pro, autocad, flac, mathcad) will work on vista???


with regards
Rohit Kumar
+91 9958910606(M)