Windows XP Service Pack 3 SP3 RC2 Refresh 

Windows XP Service Pack 3 (SP3) includes all previously released updates for the operating system. This update also includes a small number of new functionalities, which do not significantly change customers experience with the operating system.

Download: Download

Instructions:

Download the script and run it on a machine currently running Windows XP Service Pack 2. The script sets a registry key on your system. The registry key is required for Windows Update to recognize your machine as a valid target for Windows XP Service Pack 3 RC2. Versions of Windows XP Service Pack 3 prior to Release Candidate 2 should be removed before attempting to use the registry key. Windows Update will not offer Release Candidate 2 to machines with previous versions of the Windows XP Service Pack 3 beta.

Latest Changes:
The purpose of RC2 Refresh is to validate improvements to the Windows Update experience with Service Pack 3