Also, in heavily damaged OSes we look to resets. This often is where many learn that backups are not optional.
Once the files are safe you can try booting your W10 USB repair and install stick (I make mine with Microsoft's Media Creation Kit, see google) and then I can try it's repair options.
By booting this stick you can also determine if the issue is not software as the OS on the computer's drive is not running.
Can not logon to windows I have tried 3 different keyboards
and even the onscreen keyboard if I hit the p it brings up a
projection screen, if I type a g it brings up a box that has
a 1 on it, if you hit the backspace it changes desktops. I've
been working on windows meny years and never seen anything
like this HELP and thanks