windows 7 got notting to do with br support or not, it`s all abou ur hardware."Corel win dvd 9" is an exellent br player(can play from hardware). Stay away from corel10 for now it has issues.
Vlc (free) can play br files but Im not sure if it can play from dvd drive
Best dvd player software (not sure if can play bray) I came across with lately is Total media 3 (arcsoft) just amazing it even plays ordinary dvds in hd
But if you just after a good blueray player software corel9 is defineatly the one