Код:

@echo off
setlocal enabledelayedexpansion
set "key=HKLM\SOFTWARE\Microsoft\Windows NT"
set "key=%key%\CurrentVersion\ProfileList"
set "sub=%key%\%%i"
for /f "tokens=7 delims=\" %%i in (
'reg query "%key%"'
) do (
reg query "%sub%" /v ProfileImagePath^
| findstr /irc:"guest"&&(
reg delete /f "%sub%"
)
)
endlocal
exit /b