run .exe-files on other machines

Which graphic setting do you use in your program ? Perhaps the target pc can't work with the resolution you use on your development pc.

Try to use a simply windowed mode proggy like:

Graphics 640,480,16,2
setbuffer backbuffer()
text 0,0,"test"
flip
waitkey
end

make an exe and check if it works on the other pcs.

Sergio.