Final Fantasy IV : The complete collection

[Dragonslayer1]

I've had a graphical error for a while now which is stopping me from continuing the game. The first time I go to the underworld, you get in fight between the airships and the tanks on the ground, after this you're are to " crash" your own airship. than a cutscene is supposed to happen. Though im my screen i get all these strange line's and than the screen goes black.. Can anyone help me with this? D:

P.S. sorry for the bad english T^T