Isn't there some way to use the W10 disk, go to a command prompt and type in some commands to obliterate the password?

Actually Bree, there is... I went through some documents from an old...

Okay.... I followed all the steps in Option Four right up to Step 8,
125440[
where unlike the Tutorial, I got HKEY_LOCAL_MACHINE\REM_SAM\SAM\Domains\Account\Users\000001F4. No 'S' in the word...

My brother's best friend is a nice enough guy, but FAR from being the sharpest knife in the drawer....
A couple days ago he got a call from 'Microsoft', telling him that his computer was infected...