AVG
Both Norton ans Mcafee are memory hogs and cost money.
PS; Laptop or desktop it makes no difference.
I use all of the following Free software with Windows XP SP2 and Internet Explorer with MSN toolbar and the pop-up blocker turned on and have never had a single problem with my computer sense Microsoft came out with SP2. (knock on wood.) (And be sure to keep Windows and the following software Updated)
The best Anti-virus is: AVG Anti-Virus Free Edition. (www.grisoft.com)http://www.grisoft.com/doc/289/lng/us/tpl/tpl01
The Best Spyware defense is: SpyBot Search and Destroy (http://www.safer-networking.org/en/index.html)<--English version
AND: AdAware SE (www.lavasoft.com)
AND Spyware Blaster (http://www.javacoolsoftware.info/kb/)
The best Firewall besides the one that comes with Windows is: Zone Alarm (http://www.zonelabs.com/store/content/co... or just (www.zonelabs.com) and select the FREE version.
These are all FREE and are all that are required. There is no reason to pay for this kind of software, except to give a donation to the writers if you can.
ALL the above programs are recommended and should be run on a regular basis. With some the free versions they must be run manually.
The best way to avoid getting any Malware (virus, Trojan's, spyware, etc) is to practice safe computing. Microsoft and many others have countless articles on the subject of safe computing. (something I think should be taught in schools)
for further information on computer safety.
NATIONAL CRIME PREVENTION COUNCIL -> http://www.ncpc.org/media/Internet_Safety.php
http://all.net/journal/50/cybercop.html
And here...
http://www.microsoft.com/athome/security/viruses/zombies_and_botnets.mspx
http://www.spywarewarrior.com/rogue_anti-spyware.htm
CNET these 10 programs comprise the best free security software
http://www.download.com/Best-free-security-and-spyware-software/1200-2023_4-5163183.html?tag=nl.e497