[Iska]

Примерно так:

Код:

@echo off
setlocal enableextensions enabledelayedexpansion

set sProcess=notepad++.exe

(tasklist.exe /fi "imagename eq %sProcess%" 2>nul | find.exe "%sProcess%" >nul) && taskkill.exe /f /fi "imagename eq %sProcess%" >nul || start "" "%sProcess%"

endlocal
exit /b 0