XP is also available in 64-bit. Whether you have that I can't say but if you don't know yourself chances are you don't. Check 'Properties' of 'My Computer'.
I must say that 64-bit XP isn't as good as Vista/Windows 7 though, stability/driver issues are common. Vista was better but I still had minor issues. Windows 7 64-bit is very stable, fast and no driver issues at all (although experiences may differ from system to system).
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