I have my XP SP2 Machine (same problem with SP1) set up to only access infrastructure (access point) networks, and to ignore ad-hoc (peer-to-pee) networks. However, the system will sometimes connect to ad-hoc networks with the same SSID if the access point signal is very weak. This is irksome, because it makes it impossible to access the network. And no, changing the SSID is not an option. Thanks.