Hi iam having HP Pavilion Media Center a1320in Desktop PC.. iam unable to install driver for my sound card.i got driver from hp website but while installing a msg gets popup. it says install Microsoft uaa bus driver for hd audio. even in device manager-system devices i cant find MS UAA hd audio. 1 unknown device its shows in device manager. And also in the device manager-system devices- i cant find microsoft UAA....... So i purshased a new sound card and iam using it.its working fine. But the problem is realtek sound card is not getting detected. Even i searched google. but no use. Microsoft UAA Bus Driver for HD Audio is not installed. i think dats the problem. I installed kb888111,kb835221 and realtek audio codec WDM_R252.nothing happened. Actually i had mediaCentre xp installed in my system. i just formatted evrything and installed xp sp3. since then no sound card detection. unknown device.... My motherboard specification http://h10025.www1.hp.com/ewfrf/wc/...ry&lc=en&dlc=en&cc=nz&lang=en&product=1823355 help me pls.