Dear all i have 4 gb ram installed can i switch 64-bit version of windows xp for full utilization off Ram because 32bit windows have its own limitation, i am basically confusing about xp 64-bit verstion because it does not have service pack 3 so, if i play game like GTA IV that required Xp Service pack 3 please Provide help to swithing 32bit to 64bit platform My hardware Is Capable to Hand 64 bit address space.