hi, im having a similar problem. if you go to the symantec website, download rnav.exe which helps remove the 2003 prgram from your system. apparently they have a lot of conflicts with xp. but even after i did it, i still had to manually delete folders and keys out of the registry files (because theyre not all labeled symantec or norton...)
my problem is that now i cant reboot my system from the xp disk, because it says there is still a symantec conflict. has this happened to you yet?