My fm will not work on my widescreen.

Basically i got a new computer and i remember having this problem before, i have a samsung 32 inch lcd and last time on my old computer i had to add a code with my screen dimensions into the properties section of my game. But ive forgotten what the code is, so if anybody can help that would be much abliged.

thanks.

Surely a moderator or somebody should know the code?