>>It is enabled here as well. Did you try Victor's suggestion?
>
>We had already tried all options, except for:
>
>/r - we want a shutdown, not a reset
>/c - I guess it should also work without a comment
>/d - Here I am not sure, where to get the required information. User code? Code for planned shutdown? Can we put some arbitrary numbers here?

Try %windir%\system32\shutdown.exe -s -f -t 0 from a http://www.foxite.com/faq/default.aspx?id=46

Very nice tip, BTW, I already put it on my work computer and it now saves me time.