Just had a nightmare. Upgraded from Win 7 to Win 10 via free upgrade. Almost lost everything, couldn't access most apps, or even settings. Also couldn't revert back to Win 7 like they say you can. MS support is the worst I have ever encounted, in the end had to pay a local tech to recover the laptop via original recovery discs. He told me he has had loads to do in the last two weeks for the very same reason. Upgrade at your peril !!!!