Code:
on *:text:*!botrestart*:#: {
 if ($nick == [BBF]Dave) {
 if $1 == %c $+ shutdown {
    msg $chan The CrazyAOW Bot will now restart on $nick $+ 's command.
    amsg Bye!
    run C:\David\OTHER\CS\mirc.exe
    quit bye
    exit
  }
}

like this?