This page will show you on how to locate a computer MAC address
 using Microsoft Windows Xp.
 
Locate a MAC with Windows Xp
  1.   Go to Start Menu > Control Panels > Network Connections.
  2.   Select “Local Area Connection”.
  3.   Click on the “Support” tab.
  4.   Click the “Details...” button.
 
Under the Property list, the MAC or Physical Address is the
six pairs of numbers and letters in the Value list
Windows