It sounds like you do indeed have 64-bit processors - cool ---- but you still may have a 32-bit operating system. XP did come in a 64-bit option (I think it was the Professional version) and there should be something on your system display that says which version of the operating system you have. What information does it provide for your operating system when you go to the start menu/control panel/operating system?
My display has a line for operating system type - and this is where it says that I have a 64-bit OS, but XP may display that differently - it's been a long time since I've worked with XP.




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