I just installed W10 today... After few restart there's an option of booting Windows 10 or Rollback previous OS (or something) and I mistakenly choose the Rollback option... After that the Windows display: "restoring your previous OS(or something like that)" after that it become Lockscreen menu... Unlocking it, I only greeted with Blank Screen with only CTRL+alt+del accessible plus control panel... I asked people around seems my OS failed to Boot... And they suggest to Do Factory restore... Anyone countering the same problem? Is there any way I can revert to Windows 10 again? Please Help!