Dave Mirra BMX-Any Help?

I have a backup of Dave Mirra, and the game loads fine. All of the menus and options work, but when I try to play a session, or a free ride, or anything at all- the games loads to about 85% and freezes-can I fix this?I have 10 audio files and 1 mode2 file when I look at the disc in CDRwin-so I think I have all the files-help please.