have nortons av running on winxp pro and all is ok. not sure what is causing ya problem, can only suggest that ya look at symentec's web site and if that is not of any use, try emailing them with as much info you can provide
I understand that if you use XP with Norton, it should be the 2003 version. I have just installed System Tools on a new computer and it is perfect. On my old machine with System tools 2002 I did have to uninstall after the first attempt and have another go, but this can happen with any program. Why not try uninstalling and reinstalling again?