Free Online Virus Scanners

This is where I'm keeping my list of free scanners.  I may even update this list on a semi-frequent basis.

1. ESET: http://www.eset.com/us/online-scanner/
2. Bitdefender: http://www.bitdefender.com/scanner/online/free.html 
3. Trend-Micro HouseCall: http://housecall.trendmicro.com/ 

Also, update your virus definitions and get a valid copy of antivirus software.  I've been using Microsoft Security Essentials and Clamwin with pretty good results.

1.  Microsoft Security Essentials: http://windows.microsoft.com/en-US/windows/products/security-essentials
2. Clamwin: http://www.clamwin.com/content/view/18/46/

This is not a virus scanner, but it will analyze unknown binaries or links.

• Anubis: Analyzing Unknown Binaries