To get MAC id of LAN and WLAN cards
Go to command prompt in windows pc and type
In device manager both the hardware must be enabled before getting the respective output
To set or change the MAC id of WLAN or LAN card
go to control panel-device manager
And click OK.
Check out if the MAC address has changed by typing ipconfig/all in command prompt.
For advanced directions go to http://www.nthelp.com/NT6/change_mac_w2k.htm