Let your fingers do the walking:
Just look in the yellow pages...
or
Google is your friend:
Select Run or type cmd into the search bar at the bottom of the Start menu to bring up the command prompt. Type ipconfig /all (note the space between the g and /). The MAC address is listed as series of 12 digits, listed as the Physical Address (00:1A:C2:7B:00:47, for example).