I have been trying to set up a Linksys DMA2100 Media Extender on my Windows 7 Home Premium system. The Extender is wired to my ATT 2 wire modem/router. When I enter the 8 digit code into Media Center I receive the error “cannot set up Extender”. If I go to Network Sharing Center> see full map the extender is there. I have disabled windows firewall and connected the extender to my computer in order to bypass the ATT Router with the same negative results. I am at a loss, Linksys Tech. Support’s answer was to install Vista Any help would be appreciated.