Personally, I would not have anything made by Norton, (Symantec), or
McAfee on any machine of mine. They are both resource hogs, (Norton
being the worst), and don't do anything better than some free AV
programs. I got this machine last October and the first thing I did was
to remove the Norton free trial and then run the removal tool to get all
the crap off the machine.
Download and run the Norton Removal Tool:
http://service1.symantec.com/SUPPORT/tsgeninfo.nsf/docid/2005033108162039
I am using MSE, but all of these are free and do just as good a job as
Norton, without being intrusive.
AVG Anti-Virus Free Edition
http://free.grisoft.com/ww.download?prd=afe
Do a custom installation and opt out of e-mail scanning.
Avast:
http://www.avast.com/eng/download-avast-home.html
In the case of Avast, choose Custom Installation and under Resident
Protection, uncheck: Internet Mail and Outlook/Exchange.
Microsoft Security Essentials:
http://www.microsoft.com/security_essentials/default.aspx
(No e-mail scanning to worry about)