change the resolution to 640 by 480 in your res.ini or whatever your res is
Probally didn't do it the right way, but I went into the game properties, and under the compatability bar I put on 480x640 res. Then I played the game. The screen basically got extra huge and had an error message "Fallout is currently being run in compatability mode" and then I couldn't play it. Like I said I probally switched the resolution in the wrong place, so where else could I switch it?