Cubase 5 model E disc?

Trying to install but keeps saying error Model E not installed? Computer is using Vista. Any ideas please?

You could try installing the “VST Classics Vol. 1” …

Tried that thanks and still no joy. Either doesn’t boot at all or says 'invalid installation detected. Please install Model E from original cd-rom. I have reinstalled windows vista and cubasis vst 5. I can see Model E in VST Plug-ins folder. Not sure what to try next.

Did you ever solve this issue which I’ve got too?