Virustotal.com

Right click on any suspicious process or file and check it on virustotal.com with 30 antiviruses.

Virustotal is a service that analyzes suspicious files and facilitates the quick detection of viruses, worms, trojans, and all kinds of malware detected by antivirus engines.
Specs:
* Use of multiple antivirus engines
* Real-time automatic updates of virus signatures
* Detailed results from each antivirus engine
* Real time global statistics