Can't open any "Help" files

Hi
When I click on “Help” I get a “Unknown Error” notice saying “Application cannot load help files”
Your help will be appreciated.

Did you install the help files during the installation?
Go to Control Panel / Add/Remove Programs, select avast! Antivirus, click Change/Remove, and select “Change” from the avast! applet - a list of installed components will appear. Are the corresponding help files checked?