I just switched to DSL service and have the DSL modem going to the Airport. My PB 1.25 and Dell PC desktop both connect to it wirelessly. Internet connection on both works fine but when I try going into the iTunes music store on my PB, it gives me an error message that I need to connect to a network (with an [error?] code 57 at the end). It worked fine when I was on dialup. What settings should I be using?