VirusTotal Scans individual files on demand
VirusTotal is a free online virus and malware scanning tool. It analyzes suspicious files and facilitates the quick detection of viruses, worms, trojans, and all
antivirus
Avira AntiVir Personal: A Free Personal Use Antivirus software
Avira AntiVir Personal offers the protection against computer viruses for the individual and private use on a single PC-workstation. It can detects over 50,000 viruses