Do I have 32 or 64 Bit Windows XP?

This is a question which has been showing up on the Public Windows XP groups and elsewhere increasingly since the event of Worms such as MSBlast which needed a Windows hotfix. For the time being at least 64bit home computers are not that common, when systems feature an AMD Athlon 64 processors or a future Intel 64 Bit EM64T aware Pentium 4 ot Xeon the '64 Bit' status will be something highly advertised as a selling feature.

So the easiest way to tell is if you are running Windows XP – Home, Professional, Media Center or Tablet PC Edition version 2002 (or Media Center 2004) you have a 32bit version of Windows. At present the 64bit Editions of Windows are packaged with 64 Bit computers and the client versions are packaged with the name '64-Bit Edition' or 'x64 Professional' rather than just Home or Professional.

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Name	Platform	Availability
Windows XP 64bit Edition Version 2002	Intel Itanium	With New Itanium system/MSDN
Windows XP 64 Bit Edition Version 2003	Intel Itanium/II	With New Itanium system/MSDN
Windows XP x64 Professional	AMD64 x86-64	MSDN/OEM Release/MSDN

Further Information
Windows XP 64Bit Overview
Intel Itanium Information
AMD64 Platform