BLOODY MS. Win something. Upgraded free to 10. Fine for ages.
Want to sell the computer - still almost unused in the box - so do a 10 reset.
Seems okay, but now it's asking me for a key. Hologram has no key - it's a Lenovo so you'll get sweet F-all out of them. I should say, I got sweet etc.
Been all through this with Asus and MS MS sold me W8.1 for $45 as a compromise. Became a thing of the past.
Upgraded everything I could find to 10 while still free. Mostly okay. But have no idea what to do about the Lenovo except to enter it via my MS account which gets me in. Not really saleable so not at all what the W10 promotion had me believe to make me 'upgrade'.