Goodnight. There is a Windows 8.1 installed from the factory (or store). I understand that it is licensed and the key is sewn into the BIOS or where it has been sewn there recently. How to reinstall in this case, Windows? I do not have a disk. There is no key (not the fact that the key that I pulled out with the help of Everest will work).
Or you can just somehow roll back the system to the factory settings? At the same time, will the rollback be the same as the reset? It is necessary to "start from scratch."