Two truemobile 2300s: one set as gateway, the other as access point. Wired computer in basement. Two wireless computers upstairs. Access point is upstairs. One wireless connects via access point. The other wireless does not connect via access point. The gateway shows the wireless light (it never used to do this), indicating that it is connecting directly to a wireless client. The access point also shows wireless light.

 

The wireless computer that connects properly has XP SP2. The other two computers have XP SP1.

 

Any ideas? No encryption.