Do you really want to do that?
Autorun.inf is a major player in the spread of viruses from one system to another.
And autorun.inf shouldn't be picked up as it is not inherently malicious.
The detection is likely due from a piece of malware. What's the detection name?
Is it this?
SecurityRisk.OrphanInf
http://www.symantec.com/security_response/writeup.jsp?docid=2011-040403-3248-99