Scooby Doo

Hi! Yesterday I downloaded Scooby-Doo! Night Of 100 Frights for the Xbox, and I don't know if the archive is damaged or something, because it boots ''alright'', but everytime, they appear some kind of ''digital stains'' (I don't know how call them exactly), but they look horrible, and strangely they only appear in the gameplay, because when I open the game menu, or even in the loadscreens, they disappear. Can somebody help, please? I really wanted to play that game with no issues