If you need to find the MAC address of your PC, then you can do this by following these steps:

• open the Command Prompt (Start, Run and type cmd, click OK)
• in the cmd window, type ipconfig /all
• this will display the detailed configuration of your network adapters
• If you only have an ethernet adapter, look for the first Physical Address entry. It will have 6 pairs of hexadecimal digits (letter/number combinations), separeted by hyphens (-) or colons (:)
• If you use a wireless connection, make sure you read the MAC address of the wireless adapter. If you are not sure where to look, read the description field above the Physical Address entry. It should include the name of the adapter

MAC addresses (also known as hardware or physical addresses) are unique identifiers of network adapters and network interface cards (NICs) and they are assigned by the manufacturer.