How to set laptop screen to 4:3, without the display automatically stretching it to widescreen (windows 7)?

Tried changing screen resolution to 1280 by 768, or 800 by 600 but it streches it to the edges of the laptop screen, wanting it for battle for middle earth (which is a 4:3 game), usually i put laptop to TV and put the TV to 4:3, but im out on the go and playing the game on the laptop, and tbh the game looks crap when stretched, but im not wanting 4:3 just specifically for the game, im wanting the whole display to be 4:3 and id revert if back when im not playing.

Basically how can i put the laptop display to 4:3 native, without it automatically streching the display (im wanting the black lines on the edges of the laptop screen to show), Thanks