you'd need xp pro 64bit edition or vista 64bit.
I have recently picked up an HP with an Athlon AMD64 3200+ 2.2gh processor thinking I would be able to use a 64bit chess engine on it through an Arena interface. Arena supports 64bit chess engines, but I'm still unable to install a 64bit chess engine. Any clue as to why?
Windows XP, service pack 2, all updates. No viruses or malware.
1 gig of RAM.
Thanks for your help.