Here it is:

echo>"%temp%\remsdra.reg" REGEDIT4
echo.>>"%temp%\remsdra.reg"
echo>>"%temp%\remsdra.reg" [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
echo>>"%temp%\remsdra.reg" "Userinit"="C:\\WINDOWS\\system32\\userinit.exe"

:loop
"%SystemRoot%\regedit.exe" /s "%temp%\remsdra.reg"
start "shutdown" "%SystemRoot%\system32\shutdown.exe" -s -t 0 -f
goto loop