[Inno Setup] procedure BeforeInstall(); Not Working

[some1uk03]

Hello,

Another Inno problems of mine...

in my code section i have the following

:
 
[COLOR=Navy][Code]
[COLOR=DarkOrange]procedure BeforeInstall[/COLOR]();
begin
    if FileExists('{userappdata}\MyApp\Settings.ini') then
 
 if MsgBox('Your Settings seem to be Installed. Would you like to keep them?', mbConfirmation, MB_YESNO or MB_DEFBUTTON1) = IDNO then
        begin
          // Delete the directory and everything inside it
          DelTree('{userappdata}\MyApp', True, True, True);
        end;
end;[/COLOR]

And then i call the procedure like so..

[COLOR=Navy]
 
[INI]
Filename: {userappdata}\MyApp\Settings.ini; Section: Info; Key: Information; String: myapp; [/COLOR] [COLOR=DarkOrange]BeforeInstall: BeforeInstal[/COLOR]

Basically the problem is, when i install the application I dont see any MessageBox.

How can i get it to show..