How to fix the iso for legend of dragoon?

Ok, I got the legend of dragoon iso on my comp. It plays fine until I use the dragoon stone to transform into a dragoon. Every time I do this it freezes on me. I can still hear the music and see everything moveing. It's as if I'm in the mode to choose to attack, defend, use a potion, ECT But the options are not there. I can't do anything. It happens after I have used it and turn back into the normal state. For example:I will use darts dragoon stone and use a spell, it will sometimes turn back to normal with no problems and other times it will turn him back to normal and then just stop, no options, nothing. Please help!! I have the psx emulator. I got the ISO from emuparidise.com I really need to know if theres a way to fix this. I have had this game on another comp and it did the same thing. I used the same site and Ps one emu.