Here's the link for downloading XP SP3 from the MS web site.
If you're having trouble with IE, you can use Firefox which you can download from http://www.mozilla.org or Chrome which you can download from http://www.google/chrome . Of course Windows Update only works with IE.
After loading xp with service pack 2 and upgrading to IE7, was unable to get windows update to work. Learned I had to install xp 3 but can't get it past IE security. Any suggestions?