well, it's not mta bug, it's gta bug,
at first
1.delete
C:\Program Files\Rockstar Games\Grand Theft Auto Vice City\movies\*.*
2.play gta single game, then change display resolution 1152x864x16, push enter key
done.
play mta.
in additon
1.this option improve game graphic
i use gforce mx 440
2.for screnshot, on photoshop - filter - sharpen effect , resize
result
http://astro33.t35.com/temp/pic.htm