What Bios are you using and what version is your copy, NTSC or PAL? I have the NTSC version of Wild Arms 2 and the only Bios it will work with is the 7502. I have tried them all and, for me, 7502 is the only one that works. Also, when it freezes you could try pressing F4 or F5 and then F4. This often works too. Best of luck.