I've found that you first have to insert your dvd into your dvdrom, then open anydvd (make sure autostart isn't enabled), then let it search for the css keys, then open up your dvd burning software.
My system has crashed like previous posts. Restarted and reinstalled and still the same thing. I even got those problems when using old 126.96.36.199 and 188.8.131.52
Also it's a good idea that once the burning is finished, close out anydvd before you close the burning software, otherwise you'll get a system crash or anydvd will fade and not work.
Hope they come out with a fix soon..