I think the general public can now download
the Service Pack 3 of Windows XP
http://www.microsoft.com/downloads/details.aspx?FamilyID=114F3599-12AF-42B2-AAB1-B969A62C68A7&displaylang=en
Note that they indicate that this is not the final version of Service
Pack 3, but
rumors are that in 2 or 3 mon
MicroSoft has a new download available to the public for upgrading Windows XP.
More than likely you are using their latest version called Service
Pack 2 ( or SP2 for short)
The new download is a "pre-release" of Service Pack 3 ( SP3 ).
You will need a high-speed connection to download it and it