Start>Run>Regedit>ok
Now navigate to the following key:-
HKEY LOCAL MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Look in the right pane for a value called Userinit.Its value should be:
C:\WINDOWS\system32\userinit.exe,
[including the comma.]
If it reads different then double click on the Userinit value and change
it.Close the registry editor.
regards,
S.Sengupta[MS-MVP]