Keep Games in Full Screen Mode

assassins-creed

I am playing Assassin's Creed on Windows 7. After I launch the game, suppose I get a pop-up (like Windows Update). Now the game is stuck in windowed mode, and no way to get it back to full screen.

Is there any way to do go back to full screen without restarting the game, or possibly avoid these popups to begin with?

Best Answer

Alt + Enter is the magic combination to solve your problem.

PS: For Windows only.