WTF? Why shouldn't he ask this here? :/
Meh, I'll leave this closed, but incase you haven't already figured it out there's a pretty easy fix.
You'll have the Realtek mixer thingy installed as part of the driver, open that & on the top right there's an icon that looks a bit like a folder - it's above the pictures of the ports, but below the "advanced settings" option. Click that & you'll find an option to disable the annoying popup.