Windows activation

The Windows system has to be activated within 30 days. You are prompted to activate the system repeatedly. In the case you do not activate in time, a message will be displayed saying that your system is illegal. When you activate the system, this message disappears. In the case of Windows 10 you have to carefully remove the cover layer which is on one part of the activation key. More about system activation can be found here: Activation in Windows 10.