Just remember that there is no perfect Anti-Virus, and there never will be. Having a Anti-Virus is better then nothing, no matter what Anti-Virus you may have in the list. Never depend on it to be 100%, always have a secondary backup to double check periodically.
Something else that maybe of interest is Virus Total.
http://www.virustotal.com/
If you need to scan a file then, you can upload and scan with these program simultaneously.
AhnLab (V3)
Aladdin (eSafe)
ALWIL (Avast! Antivirus)
Authentium (Command Antivirus)
Avira (AntiVir)
Bit9 (FileAdvisor)
Cat Computer Services (Quick Heal)
ClamAV (ClamAV)
CA Inc. (Vet)
Doctor Web, Ltd. (DrWeb)
Eset Software (ESET NOD32)
ewido networks (ewido anti-malware)
Fortinet (Fortinet)
FRISK Software (F-Prot)
F-Secure (F-Secure)
AVG Technologies (AVG)
Hacksoft (The Hacker)
Ikarus Software (Ikarus)
Kaspersky Lab (AVP)
McAfee (VirusScan)
Microsoft (Malware Protection)
Norman (Norman Antivirus)
Panda Security (Panda Platinum)
Prevx (Prevx1)
Rising Antivirus (Rising)
Secure Computing (Webwasher)
Softwin (BitDefender)
Sophos (SAV)
Sunbelt Software (Antivirus)
Symantec (Norton Antivirus)
VirusBlokAda (VBA32)
VirusBuster (VirusBuster)
