From the looks of it, the graphics driver may not be the immediate problem you're facing (although it does need to be an approved version).
My guess is that your surface imported as a skin only and is not solid--but needs to be converted to a solid.
What I'm about to recommend is a sort of work-around hack--but it should work.
Select a truly planar and simple surface of your imported surface model (such as the back side of your ring). It should turn green, with no other surfaces being hi-lighted. Delete the surface (surfacing feature on surface toolbar), making sure you don't fill or patch the surface--you want the surface gone. You should now be able to see within the hollow surface part.
Now select all the edges that surface used to have--such as the inside diameter edges and outside diameter edges (this is why you want to select a simple flat surface). With all the edges highlighted (right-click, select loop or select chain is quick if you have lots of small edges), select the
Now select the boundaries and use the Planar Surface feature to fill the face back in. Your surface should once again be closed.
Select the Knit feature, then all valid surfaces--there should be two surface bodies--your imported surfaces and the filled surface. During the Knit feature, make sure "Try to form solid" is selected.
If your initial imported surfaces are "closed", you should now have a solid part.
Let me know if this doesn't work. There are alternative, complicated hacks to try if not.
Jeff Mowry
Reality is no respecter of good intentions.