Need help urgent

Hi guys
im new to this sit
i have a sys with
intel 965 board
4gb ram
two hdds of 500 gb and 160 gb
i was using vista 32 bit vista cracked demo version since mar '08 wit
160 gb hdd i didnt face any prob
But now i added 5oo gb hdd driver with 32 bit vista now my sys boot
lat
and with 64x vista im getting differnt boot scree
my hdd is wd caviar green
i mainly use pinnacle studio and maya
which one is better for me 32 or 6
plz help m

regards
abdussamad

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abdussamadh