There's plenty of choice when it comes to choosing effective anti-virus software. You probably won't go wrong if you choose any of the 17 programs listed below in the Award Winners box: each scored a perfect 100% on Virus Bulletin's recent tests. Most of these programs provide a trial version you can download and take for a spin, but note that some anti-virus programs are notoriously difficult to uninstall (Norton is one such), so make sure you set a System Restore point before installing.
Whichever program you choose, make sure you keep it up to date. New threats emerge on an almost daily basis, so even the best anti-virus program is only as good as its last update.
Authentium COMMAND Antivirus
Computer Associates eTrust Antivirus 7.1
Computer Associates Vet Anti-Virus
Cat Quick Heal X-Gen
* Eset NOD32 Antivirus System
FRISK F-Prot Antivirus
* G DATA AntiVirustKit
Grisoft AVG Anti-Virus Professional
Norman Virus Control
Trend Micro PC-cillin
* Denotes programs which earned 100% in every single test.