If he's running Vista and he hasn't done so already, he can try installing Service Pack 2 for Vista. It's still in Beta. A simple Google Search will reveal a link. That may help some.
Other than that, the only thing I know of that can play Blue Ray disks is PowerDVD, but from what I've read, it's buggy though and won't play all movies.
Unfortunately, it seems that Blue Ray players on computers right now aren't a good investment, due to the lack of support from anyone.