F11 key does not go to full screen

Hi, thanks for your help. I don't know what you mean by what program. I want to use the F11 key to maximize the window. When I click on the View tab and go down to the bottom it says Full screen F11. When I click on this the tool bars go away like it usually does with the F11 key.
 
OK, by "program" I meant "Firefox", if that's what you're using.

The F11 key should work for Firefox. Does your keyboard have a "Function Lock" key? It's often labeled "F Flock" and is often located at the right end of the row of function keys. If so, try pressing it - if its activated then it changes the meaning of all the function keys.
 
I have found the problem! After owning this computer for a week now I decided to actually read the manual. I need to press the Function key and the F11 at the same time. It is set for the multimedia function. I can change this to the regular function if I desire. Thanks for your help guys.