Incearca asta: http://www.noobz.ro/2015/08/02/cum-revii-de-la-windows-10-la-8-1-sau-7/
Daca nu merge poti formata partitia si sa instalezi Windowsul ce-l ai intr-o partitie ascunsa de, probabil, 25-30 Gb.
http://ro.blastingnews.com/......42761.html
Pentru stick:
https://www.youtube.com/watch?v=0jHm68sDFZY