• Goto “Device manager” from “Control Panel”.

• Double click “Network adapters” to expand it.
• Select your LAN card.
• Right click on it and goto “Properties”.
• In properties windows click “Advanced” Tab.
• Then select “Network Address”.

• After that click on “Value” radio button.
• Enter the MAC address in “Value” textbox.
• Click “OK” button.

Now you have changed the MAC Address of your LAN Card.