I'm helping a friend with her home network. She has an Airport Extreme wired to a 17" G5 iMac running Tiger and a Pentium running XP SP2. A couple MacBook Pros connect by wireless. She has an HP LaserJet 1320 plugged into the Airport Extreme. All the Macs are playing nicely. The Pentium's Internet connection works fine, but it won't print. A while back I installed Bonjour for Windows on the Pentium. I gather it worked for a day or so, then stopped working. Earlier today I uninstalled and reinstalled Bonjour. No dice. The computer won't acknowledge that there is a printer on the network, and won't let me install one. There is antivirus software and a firewall on the Pentium. (I don't remember which software packages offhand.) The correct port is open for Bonjour. Any thoughts? Also, any recommendations for attaching an HD to the Airport, for backups and file sharing? If I hook up a hub, how many peripherals can be attached to it, and how many can be shared by the various computers? TIA.