hey and welcome to the forum.

you could upload the file to virustotal.com and post the result here so we can have a lock at it.

but what you describe it sound it could be a false thread.

to be one the safe side please follow this guide and attach you logs.

a malware expert will remove if something comes up in the logs.

http://forum.avast.com/index.php?topic=53253.0

good luck.