For illegal Windows users, of course, they are used to seeing this warning on their monitor screen. This article is a kind of warning that the windows they use are not official.
In the condition that this text appears on the monitor screen, you can still use the computer without lacking anything. It's just that you can't download a free program from Microsoft if you want it.
Warnings on your computer monitor can be removed in the same way as in the video below, only when connected to the internet again, these warnings can reappear, because Windows will update the deficiencies via the internet.
How to remove the warning Activate Windows like in the video below: