Removal tools are old.Update Rapid Release definitions and then run a full scan.
For your current issue
. From a diffrent computer open registry editor ( stat - run - regedit )
go to File - Connect Network Registry
and connect to the registry of the machine which is stuck at logon screen.
go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
of that machine
double click on Userinit and change its value to C:\WINDOWS\system32\userinit.exe,