Open the Control Panel, the select the 'Sounds and Audio Devices' icon.. Once that opens, in the "Volume" tab, place a CHECK mark in the "Place volume icon in the task bar". Click on Apply, then OK.. You can then adjust the basic volume and other sound items using the "old" Windows volume control or by using the Realtek control which should still be there.

As to the sounds emanating during connection using the aircard, try muting all the "Recording/sound input" (Realtek audio input) devices using the old Windows volume control you should have now..

In addition, have you tried checking Realtek site, or your computer manufacturer's website for an updated sound driver? It might fix the issue.

Hope this helps.

Grif