Changing mac
1. Go to Start->Settings->Control Panel and double click on Network and Dial-up Connections.
2. Right click on the NIC you want to change the MAC address and click on properties.
3. Under “General” tab, click on the “Configure” button
4. Click on “Advanced” tab
5. Under “Property section”, you should see an item called “Network Address” or "Locally Administered Address", click on it.
6. On the right side, under “Value”, type in the New MAC address you want to assign to your NIC. Usually this value is entered with the “-“ between the MAC address numbers.
7.Goto command prompt and type in “ipconfig /all” or to verify the changes. If the changes are not materialized, then use the second method.