>It's a weird problem with Intel ICH9 chipset and Windows XP (both x32 and x64)
>in some HP Pavilion dv7-1100 series (64 bit).
>After starting the system Windows XP will not see the Audio Card that is "attached" to the
>High Definition Bus. We discovered (after a big headache), that the problem is related to the
>"Microsoft UAA Bus Driver for High Definition Audio" device. The only way to make it work is,
>after startup, disable the "UAA Bus Driver" and then re-enable it. After that, the system sees
>the audio card and starts using it. We don't know if the problem comes from the Intel Chipset
>or from the driver of the "Microsoft UAA Bus for High Definition Audio".
>So, while we're waiting for Intel or Microsoft to solve this, I'm going to write a small utility or a batch
>file, using the "devcon.exe", to disable and then enable the "Microsoft UAA Bus Driver for High
>Definition Audio" at startup.
>As I usually say: There is, allways, more than one way to solve the same problem.
>
>
>>>Many Thanks Al.
>>>Your direction was right on target.
>>>That is perfect for me.
>>>Again, Many Thanks!
>>>
>>>>>Hi.
>>>>>Is it possible to disable a windows device programmaticaly?
>>>>>And then re-enable it? For example, the "Network Card"?
>>>>>The device that I'm interested right now is listed in the Device Manager
>>>>>as "Microsoft UAA Bus Driver for High Definition Audio"
>>>>>Any idea will be appreciated.
>>>>>Thanks in advance!
>>>>
>>>>You might get some ideas from http://support.microsoft.com/kb/311272
>>
>>Glad it will work for you!
>>
>>Just out of interest, can you tell us why you need to disable and enable devices?

Hmm, a challenging problem. Good luck!