Hodně lidí píše, že pomohlo tohle:
http://www.xtremesystems.org/forums/showthread.php ?t=242618I also had this problem, with me it was Windows Sideshow what was causing the problem.
Just try to disable it, Control Panel > Hardware and Sound > Windows Sideshow > Windows Media Player
http://www.theeldergeekvista.com/cpanel_hardware_a nd_sound.htm