mD,
I've found that the Norton remove tool on their site works okay. You need to make sure you remove all of the Symantec components from the Control Panel -> Add/Remove Programs (there are usually three separate ones).
The AV I am using now is NOD32 from
http://eset.com
It works well, is highly rated and is unobstrusive.
I also recommend IE7 over IE6. More secure and stable and more convenient with the tabs (like Opera or Firefox). I primarily use Firefox but I use IE for some sites.
P.