I had a simple program that really worked, but i dont have it anymore. It was something like this http://tmac.technitium.com/tmac/index.html called mac spoofing btw.
even easier, (do it thru windows) 1.open network connections 2.rightclick on the lan card u want the MAC id changed of 3. go to property > then click configure 4. go to advanced tab 5. from the list, select network address.. and enter the value.. done!!
I would recommend rivunited's way since its much easier and it works fine. There is no need for a third party software required for this.
Click Start > Run. A command prompt window appears. Type cmd. Type ipconfig/all. it's the physical address