angel odin and nse now

#1
i have decided to buy a dell laptop with windows 7 having ac with angel and wish to have one with zerodha should i go with windows xp or 7. and i came to know abt 32 bt artic. and 64 bit whats this i dont know what sud i go for? pl tell me i am extrremly afraid of spending money and having a wrong combination.:confused:
 
#2
odin diet terminal based software needs some registry changes to run on windows 7 and nse now is browser based hence it is platform independent. while windows 32 bit is base for most applications