Can I revert back to my previous operating system if I don't like Windows 10? Yes. You will be able to revert back within a month of the date you upgraded to Windows 10 via the "recovery" option in "Update & Security" in settings as shown below: NB: In order to provide the rollback option, Windows 10 will keep a copy of your previous operating system in a folder called "Windows.old" which may consume considerable amount of disc space. It is vital that, if you wish to retain the option to rollback within a month of the date you upgraded to Windows 10, that you do not delete the copy of your previous operating system. Specifically, do not allow "disc cleanup" utilities to remove "previous operating systems", nor should you allow them to delete the "Windows.old" folder. Also be aware that if you reset your PC using the recovery option this will also delete the "Windows.old" folder. If you delete these folders, or allow any other program to do so, you will no longer be able to roll back to your previous operating system.