http://compnetworking.about.com/od/wireless/ht/setupadhocwifi.htm
"To set up an ad hoc Wi-Fi connection in Microsoft Windows,
first choose the "Set up a new connection or network" option in
Network and Sharing Center, then choose the "Set up a wireless
ad hoc (computer-to-computer) network" option and click Next
to start the process. Follow the instructions provided with
each step."
http://compnetworking.about.com/od/wirelessfaqs/f/adhoclimitation.htm
"The WiFi networking standards (including 802.11g) require only
that ad-hoc mode communication supports 11 Mbps bandwidth. You
should expect that WiFi devices supporting 54 Mbps or higher
in infrastructure mode, will drop back to a maximum of 11 Mbps
when changed to ad-hoc mode. Ad-hoc mode should generally be
viewed as "slower" than infrastructure mode for this reason."
It sounds a lot like a normal operating mode. Just bandwidth limited.
Paul