http://service1.symantec.com/SUPPORT/tsgeninfo.nsf/docid/2005033108162039
Pick your poison from the above to remove Norton.
Norton Trend, and Mcafee are all bloted software suites.
You need individual programs to do the proper job.
I use Avast AV, and other Security programs listed below.
It is a good combination for XP and Vista.
http://www.avast.com/eng/download-avast-home.html
Avast Anti-Virus is XP and Vista compatible (32bit and 64bit Versions),
FREE, auto-updating, and a low resources user of your computer.
And, only have 1(one) Anti-Virus installed / running on your computer at any
one time..
Conflicts may occur if you have more than 1(one).
http://www.spybot.info/en/index.html
Spybot Search & Destroy 1.6 is a very good, FREE Anti-Spyware Program.
Download, install, update, and immunize your System with it.
Then SCAN with it.
Update it, and scan your System once a fortnight.
http://www.javacoolsoftware.com/spywareblaster.html
SpywareBlaster 4.1 is a non-intrusive, FREE Anti-Spyware Program (no
scanning by you!).
SpywareBlaster prevents the installation of many so-called spyware, adware
and malware programs by disabling the CLSIDs of popular spyware ActiveX
controls, and also prevents the installation of any of them via a webpage
Update it once a fortnight.
http://www.malwarebytes.org/mbam.php
Malwarebytes is as the name says, a Malware Remover!
For the Free version scroll down their page to either download from
Download.com, or Major Geeks.com
Download, install, and update.