Operating System for 64 bit system

[Buddy]

 A computer sales person told me that to upgrade to a
64 bit system I would have to upgrade to a 64 bit
operating system...
He said I can't use Win XP since it is a 32 bit based
operating system??? Do they make a different Windows
for the new 64 bit motherboards and processors??

[Computer_Commando]

Windows XP 64-bit Edition is available.
http://www.microsoft.com/windowsxp/64bit/evaluation/upgrade.mspx