It is a genuine Windows. Computer is directly from a Microsoft partner. Have the label and license sticked to the back. I made the anti-virus checks without any exclusions. None of the programs...

I don't know if this will help, but for most languages that uses latin alphabet, you can use one display language.

Display Language / Keyboard Input

US English / US Keyboard
US English /...

That part is clear. The unclear part is if the OP wants an upgrade and keep the data from W7 installation, or a clean W10 installation will work for him or not.
Another question is, if this free...

Not every license can be moved to another computer.
If your W7 key cannot be moved to another computer, only thing seems to be using W10 on old computer.

If you have a W7 key that can be moved...

It may just be your external IP. Some bright person thought it would be a good idea to download different language versions, depending on the downloader's IP Address a while back, and some more...

full disk

Here it is.

212232

I also have the addition.txt if you need.

212216

Whenever I start the computer, Windows Defender detects Trojan:Win32/Starter.R and this happens several times after, without restarting also.
So far no anti-virus program was able to find a virus or...