do I have to select, then everything is reset and everything is deleted, except windows? (As if the laptop is like it was at the beginning)
The second should be correct
Remove everything and reinstall Windows
Is then like ex works
The 2nd deletes Windows first, but is immediately reinstalled.
So the 2nd is correct.
But windows stays on right? Don't I have to transfer Windows to a CD or USB stick and then download it?
Windows is simply reinstalled, the laptop / PC does that by itself
Just follow the dialogue
Okay thank you
From that?
Nothing at all.
What to do depends on what you intend to do with the device in the future.