hi, get the Tool Everest Ultimate Edition, which shows you ALL information you need, even the one from unknown devices.... this devices could be some features of your mainboard. Install latest service pack for your windows (suppose you are using xp) and afterwards the unknown device should get renamed to something like audio device. or get latest drivers from the ASUS Page for your soundcard or from the manufacturer, which contains the patch for the HD Audio. xp itself doesnt know what to do with hd audio, so it shows up as unknown device. the pci device could be the new security "feature" TPM-Module, which is integrated in you motherboard. it's not necessary, but u can download the drivers from your motherboard manufacturer OR you can disable this in the bios of your motherboard. with regards, PhanTom