After it's asked you for disc 5 insert disc 1 in and it should work, that's what I did.

OOC:I've never played all through BG:II, but from what I've played it is an excellent game. Planscape: Torment is the best though, in that type of genre. I haven't played NWN yet and I don't plan on paying $50 for a game.

BTW has anybody tried to burn NWN and does it work?