How to Find a Computer's MAC Address (Windows 7 and Vista)

A media access control address (MAC address) is a unique identifier assigned to network interfaces for communications on the physical network segment. MAC addresses are used as a network address for most IEEE 802 network technologies, including Ethernet. Logically, MAC addresses are used in the media access control protocol sublayer of the OSI reference model.
You can see your mac address by using following steps

    open start menu and Type ncpa.cpl into the search box and press ENTER as in image.

Right-click your Local Area Connection and select Status or just double click on Local Area Icon

Click Details and the Physical Address is your MAC Address.

Using DOS to Find a Computer's MAC Address (Windows 7 and Vista)

• Press window+r then type cmd or in start search box type cmd then open it.Dos command interpreter will open
• In the command prompt, type in getmac (with no spaces) and push enter.