VirusTotal is a free resource we ran across recently that provides free virus scanning using the engines of most popular scanning software. It has been fantastic at catching any virus we threw at it.  VirusTotal uses the following engines to accomplish this:

• AhnLab (V3)
• Antiy Labs (Antiy-AVL)
• Aladdin (eSafe)
• ALWIL (Avast! Antivirus)
• Authentium (Command Antivirus)
• AVG Technologies (AVG)
• Avira (AntiVir)
• Cat Computer Services (Quick Heal)
• ClamAV (ClamAV)
• Comodo (Comodo)
• CA Inc. (Vet)
• Doctor Web, Ltd. (DrWeb)
• Emsi Software GmbH (a-squared)
• Eset Software (ESET NOD32)
• Fortinet (Fortinet)
• FRISK Software (F-Prot)
• F-Secure (F-Secure)
• G DATA Software (GData)
• Hacksoft (The Hacker)
• Hauri (ViRobot)
• Ikarus Software (Ikarus)
• INCA Internet (nProtect)
• K7 Computing (K7AntiVirus)
• Kaspersky Lab (AVP)
• McAfee (VirusScan)
• Microsoft (Malware Protection)
• Norman (Norman Antivirus)
• Panda Security (Panda Platinum)
• PC Tools (PCTools)
• Prevx (Prevx1)
• Rising Antivirus (Rising)
• Secure Computing (SecureWeb)
• BitDefender GmbH (BitDefender)
• Sophos (SAV)
• Sunbelt Software (Antivirus)
• Symantec (Norton Antivirus)
• VirusBlokAda (VBA32)
• Trend Micro (TrendMicro)
• VirusBuster (VirusBuster)

Watch the video for details on how to use the site, or visit them at virustotal.com.