I tried installing the AirMac 802.11n Enabler and got that error. In the network utility it says. Wireless Network Adapter (802.11 a/b/g) I'm shocked my iMac doesn't support it. Bought it day of the announcement January 2006 and the Apple TV May 2007. Just got a new Netgear router today and only one MacBook in my house will make use of the extra capabilities. ****!