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Windows XP Service Pack 3 (RC) (12/18/2007) is not release for public yet. Before you try this registry hack, go to MS Download Center and see if you are allowed to download the update package.

• Microsoft Download Center → Windows XP Service Pack 3 Release Candidate.

If the above failed you may try the Beta Tester hack below.

The following registry hack will set you as one of the Beta Tester so you can download SP3 at Microsoft Download Center.

@echo off
reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\XPSP3 /f 2> NUL
reg add HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\XPSP3 /v RCPreview /t REG_SZ /d 1c667073-b87f-4f52-a479-98c85711d869 /f

Copy the above code and save it as [...]