Find a flash drive that you can format (> or = 8GB).

On a working computer create a new bootable windows 10 iso 20H2:

https://www.microsoft.com/en-us/soft...load/windows10
Download Windows 10 ISO File
Download Windows 10 ISO File
Create Bootable USB Flash Drive to Install Windows 10
Create Bootable USB Flash Drive to Install Windows 10

Perform a clean install using the new bootable Windows 10 iso 20H2.

Clean Install Windows 10