Copy/pasted from here:
http://answers.yahoo.com/question/in...7170421AA9CK5E
"To let avast! ignore the file:
Click on the blue "a" ball on the bottom right.
Select Standard Shield and click Customize
Click on the "Advanced" tab
Click "Add" and type the location of your .exe file
If you believe that your game is not a virus, compress the file in a
zip folder and send it to
(E-Mail Removed)"
As a clarification, you need to type the exact location, including the
file name, otherwise it will keep popping up. It's not a very handy
way of getting around this issue, but it's better than nothing.
-Anath