I really don't know how to describe it, so I'll post a picture. It does it on both F3 and NV. Also just posting as to not slow down the page loading.

http://i51.tinypic.com/r1d4k0.png
http://i54.tinypic.com/2dlj7fa.png Doesn't show up in the screenshot..

And my graphics settings. Well, some of them.
http://i53.tinypic.com/2jdjubm.png