Upgrading to Windows 11 might take a little tinkering if Windows Update says your desktop or laptop doesn't meet the requirements.

If you can't login after Factory Reset in Windows 11, and after factory reset you are still prompted for sign in but sign in is impossible, see this post.

When Windows decides that it isn't interested in completing an upgrade, it can be maddeningly unhelpful, spitting out error ...

To format a hard drive before you start using it in Windows, use the Disk Management utility; on a Mac, use Disk Utility.