That's it, that I'm not exactly sure, which codec I'm using. I instaled some codecpack. Do you have any tip of right codec? Sorry for my not knowing of it... and thanks also for all your help again...
I am using PowerDVD 7 which supposed to be one of the best to handle HD stuff. Also I have standard MPV and MPA codecs which come with MP.
Aparently windows selects which codec to use automatically, but it should be a way (I guess log file) to tell exactly which codec is in use. I am not 100% sure as I am very new to all these systems.