Windows 7: Cant see gunbound or other games in full screen windows 7 sony vaio

My laptop is a sony vaio with amd radeon graphics with windows 7 premium
I already tried many things that i found online but my game still keeping running on a small screen and idk how to play this game in full screen. I tried to change the resolution and also put on full screen also putting my 1366x768 and also check the properties of the game and put compatibility with windows 7 and change the resolution to the game to 600x800 and many other things and nothing my game is working perfectly but it just in a small windows on my screen
plsss someone with this problem helppppp me with the steps to follow to play this game

anyone help plzzzZ???;/