Problem with Ocarina of time

I have a problem with Zelda: ocarina of time to Pj64.
My problem is that I can't get the horse, Epona. I have raced ingo and beated him in the two races and then he say I would never leave his ranch and then I try to jump over the gate or the walls around it but when I jump, the whole screen turns white (more like lightgrey) and I can't do anything but shut down the emulator.

I have tried both to start another file and download a new project64 from another place but nothin works.

Please help me fix it cause I can't finish the game without epona.

Ootmaster

Yeah, I can beat the game but I can't get biggoron sword and some more things.
How do I check that my rom is good?

ok, but can I have them on before I try to jump?

thanks for all help, now I have the horse at last!