Uncontrolled Feedback from the ECO.

If you are having uncontrolled feedback such as loud squealing from your integrated ECO, you will want to go in and check your Volume Control settings within Windows XP. 

To do this, minimize your ECO software, open the speaker icon in the upper right corner of your device, and check your Microphone Settings.  The Microphone should have a check mark in the Mute Box.

This is a picture of the Volume Control Menu in Windows XP.