How to fix missing user account names at login
The problem is when you launch Windows, there is no way to login – all the user accounts appear to be missing.
Go into Safe Mode (pressing F8 at boot up will get you there)
Login to an available profile
Start > Run > type cmd.exe [press enter]
Type the following commands:
REG.EXE ADD “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\Credential Providers\{6f45dc1e-5384-457a-bc13-2cd81b0d28ed}” /t REG_SZ /d PasswordProvider /f
REG.EXE ADD “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\Credential Providers\{6f45dc1e-5384-457a-bc13-2cd81b0d28ed}\LogonPasswordReset” /t REG_SZ /d {8841d728-1a76-4682-bb6f-a9ea53b4b3ba} /f
