I constantly have a problem using WMC Live TV. Upon an initial startup the sound is fine however after I exit WMC and attempt a restart I get no sound. I can restore the Live TV sound only through rebooting the machine. This sound problem only occurs in Live TV - all other WMC & computer sound functions continue to work. I'm using Win7 64. ATI PCI-e Tv Wonder card. Asus onboard sound VIA High Def Audio. All Drivers are updated. I have tried reinstalling WMC. and control panel sound options have been tested. Any Ideas?.