Hi,
Uninstall the audio driver you downloaded (not sure what you installed) and install this Audio Driver (Its from my previous post):
AUDIO:
http://www.mediafire.com/?dg0cmmkm4y4
Extract Files to a folder. Run the installer. If it errors upon installation use device Manager.
From Device Manager, right click "Audio Device on HD".
Choose Update driver.
Check no to connect.
Install from a list or specific location.
Don't search I will choose the driver to install.
In the list of common hardware types, scroll down and select Sound, Video, and Game controllers.
Remove the check from "Show Compatible Hardware" and click on "Have Disk".
Next...browse to the unzipped folder and choose the "WiSVHe5.inf".
Ignore XP when it complains.
Reboot.
This should resolve your Audio/mic issue.
Let me know how you make out.
Bill