not realy sure if im in right spot

bought a toshiba tecra 8200 with built in wifi when it searches for my router it has no trouble finding the net work, but when i try to connect using the net work key supplied by my provider(sky) i get message whch reads
the network password needs to be 40 bits or 104 bits depending on your network configuration this can be 5 or 13 ascil characters or 10 or 26 hexadecimal characters .my sky network key only has 8 .
any idears how i get the laptop to except 8 characters only


ps:running on xp pro