Start menu, Run:
cmd.exe type in
Here you need to look at the columns Physical Address. There may be more than one line. If you are connected to a network via UTP cable you should choose one under Ethernet adapter Local Area Connection (or something similar), or if you use Wi-Fi, then the one following Wireless LAN adapter Wireless Network Connection.
This process is similar to the previous version of Windows, but the command line can be started on the desktop by right-clicking the Start menu icon.
Here, lines with HWaddr contains the relevant data.
The MAC address is displayed in the line starting with Ethernet Address.