Ive setup quite a few, and other types of extenders. SOmetimes it helps to fully remove the configuration from BOTH the PC and the xbox. And then re-initiate teh setup, even trying from the opposite unit. If you started the setup from PC last time, start the process from the xbox next time. If you still have issues, remove the config from both sides. Uninstall WMC, reboot, re-install WMC, then start over. I have had that last step fix a few particularly troublesome installs.