Under the DVD Region Free options, there should be a list of programs you can add to have DVDRF autorun with. WinDVD was already in the list, but I had to add PowerDVD manually for some reason. It worked great with both after that.
Edit: Re: your second post, what DVDs are you having trouble with? I have a mix of R1 DVDs from the U.S. and R2 DVDs from Japan, and they haven’t given me any problems. Some grey-market HK flicks from my local comic-book shop have locked up the drive, but otherwise DVDRF works like a charm.