Cubase Elements 8 cannot find Halion Sonic SE Library..

HI there

I bought Cubase Elements 8 a week ago and love it. I have also been enjoying Halion Sonic SE. but today for some reason Halion will not load up any sounds. Groove Agent is having the same problem. They both worked fine for a few days so the library must have been installed.

Can anyone please tell me how to fix this? I have uninstalled and re installed Halion and the library from the disk but still the problem.

Do I need to re install the whole of Cubase to fix this?

Please help

Many thanks