I changed it to "blank". No one is now the owner.
You can't change it to
Blank so I'm guessing you have done something else altogether.
Given you numerous postings about not being able to even click C:\ without an issue, your best option would be to perform an in-place upgrade by downloading the latest Windows 10 ISO, then right-clicking on it and selecting Mount, then run the Setup file. This will allow you to reinstall Windows 10 over the top of the current one, and my advice would be to choose
not to save settings and files to allow it to complete the install without crashing as a result of whatever it is you did in the first place.
You'll lose personal files, but at least you'll have a functioning computer again.
If you already had Microsoft's OneDrive activated, most of your personal files will be saved there anyway, which you can access once you have a fresh install of Windows 10 working again.