Do you have a 64 bit processor and a motherboard capable of handling it?
Windows XP Professional x64 Edition is designed to work with 64-bit processors from AMD and Intel that support the x64 extensions to the x86 architecture. These include the Athlon 64, Athlon 64 FX, Mobile Athlon 64, Turion 64, and Opteron processors from AMD, and the Xeon with EM64T and Pentium 4 with EM64T from Intel.
Q Can I run Windows XP Professional X64 Edition on my Itanium Workstation?
A. No. The Itanium processor is a 64-bit processor that has a different architecture than the x64 processors. A version of Windows XP for the Itanium processor is no longer available. Windows Server 2003 Enterprise Edition continues to support the Itanium processor.
Q. Can I run Windows XP Professional X64 Edition on my Centrino laptop?
A. No, the Pentium M series of processors used in Centrino laptops are not 64-bit processors and can not use the x64 Edition of Windows XP Professional. There are x64-compatible laptops currently shipping that are based on AMD processors.
Other questions answered here:http://www.microsoft.com/windowsxp/using/6...sel_x64faq.mspx
Edited by Enthusiast, 12 October 2005 - 08:44 AM.