I have took the liberty of showing some online virus scanners.
Some of the scanners are using more then one anti-virus engine and it could give a better observation/deeper at the file.
Even more, when you open a case at symantec with a virus problem, having a complete analysis of the file could help the symantec support to give you better service, and deal with your problem faster.
What free engines do we have out there?
1) First of all, we have the symantec virus submission. submit.symantec.com/websubmit/retail.cgi
This option is for home users. business users should upload the file here:
https://submit.symantec.com/websubmit/gold.cgi (you can only use this if you are a gold customer - it won't provide access otherwise).
https://submit.symantec.com/websubmit/essential.cgi (you can only use this if you are an "essential" customer with appropriate customer support agreement - otherwise it won't provide access).
2) there is Virus Total: http://www.virustotal.com/
They have a lot of virus scan engines (about 30) , and they give a full report suggesting what each virus scan engine found.
3) Threat Expert: www.threatexpert.com/filescan.aspx , for me this is the most informational online scanning engine.
4) Sunbelt Sandbox - www.sunbeltsecurity.com/Submit.aspx (click on research toolbox and then "submit to CWSendbox")
Sunbelt have built an engine that runs the file in a sterile environment and tells you exactly what the file tryied to do like add a value to the registry and more.
not a scan engine but gives a lot of information about the behaviour of the file.