I can't let Grand 3 run after Cubase update

My problem started with the update to Cubase 5.1.1. When I wanted to activate the Grand 3 in Cubase a popup with a problem message appears, see att. Later updates and -grade to cubase 6 don’t solved the problem. So I can’t use my beautiful Grand! This was on my old windows XP but is also on my new Windows 7, i7 6GB computer.
the mail help with Steinberg couldn’t help me. His last suggestion was I can use the Grand as a rewire instr. Unfortunately I don’t know how to manage that. Is there someone who has the solution? thanks.
Grand 3 stops.png

hopefully the att.
Grand 3 stops.png