Can't re-enable microphone array

[GaryMac]

Folks-

I run run Vista Home Premium SP2 on a Dell XPS M1730 with built in
microphones(2). I inadvertantly disabled the Sigmatel Hi Def Audio
microphones from:

CONTROL-PANEL\SOUND\RECORDING\CONFIGURE

I expected the microphone array would appear with a CONFIGURE option to
enable it...but it no longer appears under RECORDING and I can't figure out
how to get it back. Any suggestions?

Thanks.

-Gary