recently, i unable to play my game in full screen mode.
i remember that it works well before.
i dont know whats is my register in regedit.exe has been change??

anyone know how to solve it?

What game are you trying to play?

Is this a problem where you are running the game at a lower resolution to the default screen resolution.

Try running the game at the default screen resolution, or changing your res in Windows before starting the game. If this the case, I'm sure an answer can be found.

no...not the game setting...
i think is my computer setting...

I asked before what game are you trying to play because if it's an older game you can right click on the icon, go to Properties, choose Options and put a dot in dot in Full Screen.