When it is time to get a 2nd opinion on a file that might be infected, visit www.virustotal.com (imo, it's worth adding it to your favorites)

This awesome site uses over 30 different well-known scanners to analyze the submitted file.

Step 1: Submit the file in question by clicking on Browse button to locate the file and select it.

Step 2: Click Send button to have the file uploaded and queued for processing.

Step 3: Wait for scanning to complete; STATUS should read COMPLETED