You can edit the avast4.ini file with notepad.
Find the [Simple] section in the avast4.ini file and create a new line under it and paste this into it ShowHelpCheckList=1. That will kill the help info, save the changes, the avast self-defence will have a whing about the changes answer yes to save it. You could of course disable the self-defence before the edit, but this is probably best as you won't forget to enable the self-defence again.
So after the edit the first part of the [Simple] section should look like this.
[Simple]
ShowHelpCheckList=1