First up, I would like to thank everyone who have commented on my build plan last year. You guys were right - I don't need to build a new one since my current PC is still good. It was a happy ending. Now, the sequel. So now I have the itch again. All those talks of the new i7s have gotten me scouring the net for research. Plus with two of my favourite games' sequels , Battlefield 3 and Arma 3, will be Windows 7 exclusives, I've been finally tempted to move on to that OS. So this will be primarily an OS question : I want to buy Windows 7 64 bit so I can have more than 4 gbs of RAM. But after looking around the local stores, I don't see any mention of which version of the OS they are selling. Is Windows 7 sold separately according to bit version or is that option become available during installation? Or did I missed something? I know it's a naive thing to ask but this will be my first foray into the 64 bit universe so any advice would be appreciated.