Just figured the solution to this!
The file that is doing this is macidwe.exe, and is starting either ceswxfst.sys or tcexfst.sys or cfexfst.sys. And They all play audio snippets off the web.
If you right click on My Computer, select Manage, go to services and applications, services, and then find the Macidwe Service. Right Click on that, select properties and change the startup type to "Disabled"
Press Ctrl+Alt+Delete and kill all processes you know are associated with this. Macidwe.exe and all the .sys files will be in the Windows/system32 folder, so just find the ones you see pop up when sounds play and delete them.
You should no longer have the problem. I think i just posted the first solution to this on the web :D