DavidR
2
Hi and welcome
This topic is covered in the following thread.
http://forum.avast.com/index.php?board=2;action=display;threadid=4764
Hopefully this should be help.
There is a large amount if information on the forums and it is all available to you using the search button at the top of each page.
A search on false positive returned 20 posts (including this one)
Hopefully you will only ever have to worry about false positives