could this be a problem with the wireless modem set-up (it was set up by another person who plugs her cpu directly into the modem upstairs. she did not know it was a wireless unit, and i tried to get wireless access to it before it was set up with a security keyphrase for the wireless aspect of it)? signal strength is excellent, but i only am allowed "limited access" or "local access" to the network; internet access is not allowed!