I have had a lot of problems with norton myself. There are a load of instructions to go through on here:
http://service1.symantec.com/SUPPORT...is&svy=&csm=no
if that dosent work then go through these instrutions to get rid of it
http://service1.symantec.com/SUPPORT...0&osv=&osv_lvl=
hope that helps
edit: id be careful before you go deleting files!! make sure you dont delete the wrong ones