Hi!
Can you add these lines before level_load in your main?
video_aspect = 1.333; // enforce 4:3 mode if you do not want widescreen in effect
video_mode = 7; // start resolution 800 x 600
video_screen = 1; // start in fullscreen mode
video_depth = 32; // otherwise 32 bit mode
wait (1);
Then if it doesn't work show us your corrected code.
Try to place your code in code box ....[code]