It sounds as though it's finding the network but either not having a valid IP assigned or not authenticating correctly.

Is the wireless router using DHCP, and if so is your laptop set to use it? Also, do you have security enabled on the router such as a WEP key? If so, have you added that on your Toshiba laptop's network configuration? If not, then your laptop may appear visible on the network but you will not be able to access anything as you are not "logged on" to the network.