Here are my system specs. Asus A8N-E Mobo,Nvidia ultra4 chipset,7600gt nvidia,939 socket AMD 3500 processor,built in sound card I belive AC97, Windows XP SP2.. I've done everything I know to do and I can't find any info on the same audio codec I had. I've download other audio codec's but no luck.I also updated my sound card driver still no luck . My video plays but Audio doesn't. I have spent a lot of time on this and it is very very annoying. I've used gspot but no luck can some one please help me!!I do not have XP disk. I ran system info and it said evrything was good except it said sound card not found if one is expected, you should install one by the manuf. In sound and audio folder under realtek AC97 Audio general it says This device is working properly so that means I have a sound card installed right? The yellow ? in device manger says unknown I tried to install hardware by right clicking update driver but it doesn't find anything. I did a unknown device scan and it said PNPID usb\unknown, also I get no audio mixer device available.