are these the original cds/dvds you bought with the styles on? if so you need to install them to BIAB. should work automatically when you isert the disc but if not search the disc for a file called setup.exe or similar.

i think that's the problem. have you got BIAB installed properly on your pc? even very old versions come with some built-in styles so you shold be able to at least create some basic songs. then load the style discs.