I have a MacBook Pro, the wife uses a Toshiba, and I also have an HP (all laptops, at home).

They all connect to the internet and print wirelessly via an Airport Extreme, but I also have an Airport Express setup to send music to my stereo from iTtunes. It's all one network.

This works great with the Mac and Toshiba, but not with the HP. It can send email and full internet, but iTunes doesn't show the menu to select where to send the music. It can only be played via the computer.

Any ideas?