I will also check with one of my colleagues in the office if he has any ideas as he works on kiosks a fair bit.
Doesn't the latest version of Windows (8.1) have a special kiosk mode? Don't know much about it yet but might solve your problem although it sounds like you have the same customers that we do - Can we have the gold plated solution at the paper and string price (and by the way, we don't want to pay you for all the work you've done)!!!
Don't know if any of this helps but who knows!
Thanks for that link and the info on Windows 8 Kiosk Mode. Seems Win8 will only run Moderen Apps (Metro) under Kiosk mode, but that still may also be an option as I can simply write a Splash Screen App that allows me to launch what I need.