Unable to use the mouse on the main menu
This normally occurs when the resolution set in the game is higher than the resolution for windows. As such when you click the mouse, windows is not giving the game the correct location that you clicked on screen.
Find the windows resolution by doing the following :
Click Start(>settings, depending on start menu layout)>Control Panel>Display
Select the settings tab. The screen resolution is displayed in the lower half of this window
Next goto "Start>Programs>Firefly Studios>Stronghold 2>Stronghold 2 Graphics Configuration".
This will load up the settings for the game, goto the "General" tab.
This will show the resolution settings for the game, set this to match the resolution set for