Ide i preko updatea,znači prvo idete ovdje na Windows XP Service Pack 3 Release Candidate 2 via Windows Update i skinete tu stinicu koja
Windows XP Service Pack 3 Release Candidate 2 is available to the public. Specific registry settings will allow you to be offered SP3 via Windows Update.
omogućuje skidanje SP3 preko updatea,instalirat ju i trk na Windows Update.

Ili ova starija release candidate verzija http://www.microsoft.com/downloads/d...displaylang=en koju odmah možete skinuti. (ADSL veza obavezna )