Well, it's not about audio itself, which I wrote before to Justandolduso.
Playing a simple midi file on PTW4 using the simple soundcard drivers.
All other audio funtions, as playing videos or any recorded sound , in Windows player,VLC or any.
What for me, still remains a doubt, is the fact that a recorded sequence , which includes in my case audio and midi, and that for checking the midi, I do remove the audio recorded tracks and save the sequence as midi file, 0 or 1 , could cause that error, which is poping up there after saving the file, and replaying.
What is your thought?, makes sense?
other reasons, wrote about malware, I don't know.