I had the situation over the weekend where I just couldn't log onto my laptop. My username, administrator, safe mode, nothing would get me past the blasted username/password fields.

Many hours later I googled the solution:

With the mouse, place the cursor in the password box. Press TAB, & then press Enter. Hey presto, you're in as a new user.

If like me your old profile is corrupted, favourites etc will be forever lost, & the new user needs to be set up again. But al least you're in.

Regards
Max P