I came across a site called www.virustotal.com. This site lets you upload a suspicious file to be scanned by multiple virus engines. This is a great tool. I have learned that not any one anti-malware or anti-virus program can catch all viruses. This is the best way to check out a suspicious file without loading multiple anti-virus programs on a computer. Yes this site is completely free and that is why I wanted to share it. This is from the site itself:
VirusTotal is a service that analyzes suspicious files and URLs enabling the identification of viruses, worms, trojans and other kinds of malicious content detected by antivirus engines and web analysis toolbars.
Free, independent service. Runs multiple antivirus engines. Real time automatic updates of virus signatures. Detailed results from each antivirus engine. Runs multiple web site inspection toolbars. Real time global statistics.
Here is a list of the virus engines that Virus Total uses when it scans: