Anyway if you really want to move to 64-bit , wait till Windows 7. Only games such as GTA IV can take advantage of 64-bit. If you run in 64-bit , you'll gain much more fps. It seems that next-gen games which were written for 64-bit and 32-bit would be better if you ru it on a 64-bit platform rather then 32-bit

Other then that its troublesome. I've decided to stick with 32-bit for compatibility sake. Few fps gain and faster speed and full ultisation of RAM isn't my kind anyway. Sure , I am not making use of my 4GB fully