Window XP SP3 Build 5512 already release to window update finally,ahead of schedule release on April 29,2008,there are total 6 language Window XP SP3 versions available to download.
You need to have manually update via Microsoft and Window update or download standalone update package from Microsoft Download Center.
1. English version ( 316.5 MB) MD5: bb25707c919dd835a9d9706b5725af58 SHA-1: c81472f7eeea2eca421e116cd4c03e2300ebfde4
6.Simplified Chinese version