Hmmm. You could try the sledgehammer approach, noted in this forum:

How to recover a corrupted Vista driver database:
[url]http://forums.logitech.com/logitech/board/message?board.id=bluetooth&message.id=3755[/url]

"Clayton" <claytonbNOSPAM@xtra.co.nz> wrote in message
news:uGDKjf0yHHA.1132@TK2MSFTNGP02.phx.gbl...[color=blue]
> I've downloaded the AC'97 drivers for Vista from the Realtek site and
> installed, still showing the High Def diver as usual, I keep removing it
> and on restart it comes back, god only knows why it is doing that when the
> mobo doesn't have high def audio
>
>
> "dean-dean" <dean-dean@discussions.microsoft.com> wrote in message
> news:uKnxMTyyHHA.3564@TK2MSFTNGP04.phx.gbl...[color=green]
>> Well, contrary to your subject line, having just looked at the specs for
>> P5VDC-MX on the ASUS website, your computer may not use the Realtek High
>> Definition Audio Driver, but has rather the Realtek ALC653 AC'97
>> 6-channel Audio CODEC.
>>
>> [url]http://www.asus.com/products.aspx?l1=3&l2=11&l3=242&l4=0&model=814&modelmenu=2[/url]
>>
>> I am unable to get to the ASUS downloads page for that board, for some
>> reason, although this from Realtek might work, if indeed AC'97 is what
>> you have (a Vista driver is listed):
>>
>> [url]http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=23&PFid=23&Level=4&Conn=3&DownTypeID=3&GetDown=false#AC[/url]
>>
>> The ASUS downloads for you board *should* be here:
>>
>> [url]http://support.asus.com/download/download.aspx?SLanguage=en-us&model=P5VDC-MX[/url]
>>
>> "Clayton" <claytonbNOSPAM@xtra.co.nz> wrote in message
>> news:OGRvCKxyHHA.1208@TK2MSFTNGP03.phx.gbl...[color=darkred]
>>> dean-dean, I have no PCI cards installed
>>>
>>> toolman3044, where can I get the ASUS Hi Def drivers from?
>>>
>>>
>>> "toolman30044" <toolman30044.2tzbqi@no-mx.forums.net> wrote in message
>>> news:toolman30044.2tzbqi@no-mx.forums.net...
>>>>
>>>> You might want to check also to make sure you installed the Chipset
>>>> Drivers. And while Asus has Hi Def drivers for my board(p5b) they are
>>>> not signed yet.
>>>>
>>>> Hope this helps.
>>>>
>>>>
>>>> --
>>>> toolman30044
>>>[/color]
>>[/color]
>[/color]