Hi , so if it's not much changed , it makes no sense to replace it, right ? I'm just afraid of replacing Vista's files , because the sound might get worse overall .
One of the reasons I reject all later windows - awful sound quality . Could this be DRM related ? Yet again , the same problem exists in XP (only DTS stereo avaible).
What I did today : I've found an updated SP2 ISO (to December 2015). Should be much newer than Win7 RTM 2009 , right ? ))
So I installed it ... and guess what - all the same ! Then I took a long breath and installed it on my friend's similar hardware , same too.
Then I added "playback devices/supported formats" , registry entries from W7 , now it lets me choose DTS-HD and TrueHD ,
then I installed PowerDVD and it also lets me choose "HD uncompressed audio" in it's settings , but as soon as I start to play
DTS-HD file , it reverts to ordinary bypass setting, I mean DTS (not HD). So one can safely assume : it has nothing to do with
updates and/or "playback devices/supported formats" settings , it's a much deeper problem, perhaps Vista isn't capable of
playing HD audio at all ,which I find strange. I also find a bit strange that no info could be found ...
Edit:
Also, not a hardware problem (definitely)