What is wrong if you put all your Crysis warhead graphics low and it still is weird

Here are some things you should check :

• check if your computer has the minimum requirements for playing the game
  
• see if you have installed all the drivers or reinstall the latest drivers for your hardware
• download the latest patches for your game and install them
  
• try to clean up some memory by closing programs or by restarting the computer

Please keep in mind that the companies cannot make the game compatible with absolutely all the components out there and you may have a component that is not supported by the game.