I had experienced such problem before but it only occured when I was stopped my homepage from loading on opening internet explorer or when i type a new web address on the address bar before my homepage loads completely.
If this is similar to the problem u have, i suggest u let your homepage load properly first or u change your homepage to the address web address u want to load
If u didn't experience this problem immediately u installed windows, i suggest that u use System Restore or u reinstall windows XP and try it first before installing any update.
If u do not experience any rpoblem after u reinstall, install all the programs and updates u initially had one by one and check if internet explorer would give the same problem aftereach installation or update.
I hope this cures your problem and don't forget to rate my answer