Windows 7 Why is the game window not maximising?

[Deo]

The game doesn't go full screen and there is nothing I can do about it. The bottom part of it is off the screen.

 

[Pauli]

The easiest explanation would be that you play the game in window mode, and have got your window moved downwards. The exclamation "There is nothing I can do", I don't believe.

Settings may depend on whether you play single or multi, Steam or in a society. But check that you have Full Screen set.