Another good alternative is to scan the detected files with a meta-scanner such as VirusTotal, which combines the engines of several antivirus scanners and gives you the result for each one. Good way to single out detections of a questionable nature (possible false positives).
VirusTotal
Another good alternative for a free online antivirus scan would be the Kaspersky Lab Online Virus Scanner:
Kaspersky Lab Online Virus Scanner