Vray won't load

I haven’t had an issue before, but i set up a render and came back to find the render finished but computer frozen. restarted in morning, vray is no longer an option for rendeing, the vray buttons are there but dont work. I haven’t removed the dongle, and from other feeds it seems un and reinstalling rhino/ vray doesnt work.
thanks in advance, sian

Hi Sian- is VRay listed and enabled in Options > PlugIns page?


Thank you! i thought i tried everything, i think this still a helpful thread, as it seems lots of people have not known where to go to fix it.