help opening logic 7.2 files n Logic 8 please

Logic pro 8 works fine when open. Have recorded several songs with it,

However when I attempt to most of my Logic 7.2 files, it crashes over and over gain. It seems to search for and load files, but will not open after it does. Any help is greatly appreciated as I have some valuable songs from logic 7. I did remove logic 7 finally, but it also did it when it was loaded.

Thanks
Gabriel