I have a pc with an X-FI Xtreme Music with Logitech Z-5450 speakers and headphones Sennheiser HD595. Until I was Windows 7 everything worked perfectly with the sound quality right, with all sources. Since I installed Windows 8 (using both the creative drivers for windows 8 and the latest beta that were for 7) I noticed a drastic decline in quality audio with the sound gets distorted, "croaking" a little of many sounds. The sources used are flac, mp3, mkv, avi, which play "perfectly" on the same hardware under Windows 7. I have used various players, and the worst result is obtained with VLC, better with foobar and media player. Would you be able to help me to identify the source of the problem and maybe solve?