Currenty have a home network setup using a Telus modem and a Airport Extreme. Works great. Trying to extend my network and in doing so obtained a Airport Express. When I powered up my Express for the first time; my Airport Utility recognized it; message said "preparing" but a error message popped up stating " Unknown Error occurred"; it then shut down. This happens everytime I power on the Express. Is there a setting in Extreme that has to be changed. I am not hard wired; I am going wireless.