Crisis Core Final Fantasy VII

[Newmani]

Hello there, can anyone help me?

I'm at that point in the game where Hollander and Genesis decide to attack Midgar but for some reason randomly whenever I'm attacking a copy of Genesis the video card crashes. This wouldn't be much of a problem but... the emulator crashes too (black screens to be exact) and I can't continue at all. I'm not entirely sure why it's doing this NOW, as the game was running perfectly fine before that.

I have an AMD Mobility Radeon HD 4650 video card, and it's been acting up with every other PSP emulator I've tried playing Crisis Core with. I'd be eternally grateful if somebody can help me circumvent this, as I'd very much like to actually play the game through. ; ;