First, open the Device Manager. On Windows 8 and 10, press Windows+X, and then click “Device Manager” on the Power User menu. On Windows 7, press the Windows key, type “Device Manager” to search for it, and then click the “Device Manager” entry. The Device Manager app will look the same no matter which version of Windows you’re using.
In Device Manager, under the “Network adapters” section, right-click the network interface you want to modify, and then select “Properties” from the context menu.
In the properties window, on the “Advanced” tab and select the “Network Address” entry in the “Property” list. If you don’t see this option, then your network driver doesn’t support this feature.
Enable the Value option and type your desired MAC address without any separating characters—don’t use dashes or colons. Click “OK” when you’re done.