Sorry to say this, but I think you have to live with it. I have exactly the same problems and posted them here 3 weeks ago. I tried 10 (!) different drivers, but nothing works.
What's really a problem in my case, is that because of this bug I can't use the lightsaber (I can only see his feet). I don't mean that it is difficult to slash somebody, it's not even possible! Because the character can't move his upper part; I can only run around.
This is the reason why I had to stop playing at the end of the trial level because that's the first time you have to use the lightsaber.
So raven, release a patch soon or you can stick my copy in your ***