system
2
To find out if its a false positive or not, upload/scan the file detected with this online scanner here (link below).
http://virusscan.jotti.dhs.org/
let us know the results 
And to stop the false positive from being detected (if it indeed is a false positive), send/email the file in a Password protected archive (winzip or Winrar are best for this) to virus@avast.com , in the email mention that you think its a false postive and why. also the filepath you found it in, and also any other info you feel is nessersary.
–lee