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phnguyen89 said:
Here is the deal, all new CPU should be 64 bit compatible. The license for Windows 7 is good for both 32/64 bit for any edition. So if you have say Pro (get at least Pro), then you can switch out to 64/32 any time, the hassle is the re-installation.

I suggest you get 32 bit. The deal is that 64 bit is still a bit of an issue with compatibility. (Also, Windows 8 is supposed to be 128 bit).

My example of incompatibility: I am researching for my professor on CUDA for structure from motion. x64 Windows does not support CUDA with visual studio 2008. I tried all the hacks, but none of them worked. Once I downgraded to 32 bits, I just installed it and everything worked immediately.

Like I said I'm more of a casual user, 95% of the time all I'll be using is internet browsers and the other 5% would be anti virus programs. And the odd time some games.

(And I guess WMP is playing 100% of the time.)