x32 bit or x64 bit?

It's depend what you used to do with your PC. you should read this: http://lifehacker.com/5431284/the-lifehacker-guide-to-64+bit
-vs-32+bit-operating-systems

You combined the naming schemes :\

Intel have their own little thing going where
x86 = 32 bit
x86-64 = 64 bit

Although x86-64 can be abbreviated to x64 but there is no x32.

X64

x32

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x64 too

althought Im not completly aware of the difference -_-

ok... now Ive read pacman74's post XD... enlightful article