Cubase elements doesn't find guitar rig

Hi Folks, I recently upgrade from cubase le to elements. It all worked fine except guitar rig doesn’t appear in my plug in list. Other plug ins are fine. When I check my vst file guitar rig5.dll seems to be there ok its just not being recognised by cubase. Any thoughts much appreciated. I’m a bit of a newbie so keeping any responses simple would be appreciated. Thanks.