Be aware that kwallet will require you to enter your password if you auto-login. Kwallet usually saves your passwords for wifi etc. That’s why auto-login with KDE doesn’t make much of a difference in most use cases

It’s probably gone. But maybe you could have some luck looking for it in your BIOS like others suggested.

I haven’t used windows in quite a while, but while I did, on laptops sold with windows there was a recovery partition on them you could reinstall windows from. If you removed that partition you had no legal way of reinstalling, because no key was made available to you at any point.

MX Linux

Source: https://gitnux.org/most-popular-linux-distributions/

That sounds like the error message of a dev that handed in his 2 weeks.