I recently had to reformat my computer. Before, my system was running very smoothly, I updated vista x64 to windows 7 ultimate x64 and everything was great. Because I updated my MB, for some reason i was only able to boot twice, then no more. I reinstalled Windows 7 from scratch, installed all the latest drivers and windows updates , but now all sound: system sounds, mp3 and videos sound like a skipping LP.
I use the HDMI from my ATI HD 4850 and as Speedlink Medusa 5.1 usb headfones. with both devices I have that problem.
Phenom II x4 955 BE
Asus M4A89GTD PRO /USB 3
OCZ DDR3 10666
ATI HD 4850 1GB