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This is the Audio Device Graph Isolation service, a part of Vista and 7's audio services. The real audiodg.exe is harmless, but like any file it could be infected. If it's not doing anything, it should be fine. The worst that can happen by ending it is your audio goes out, restarting your computer would fix that.
To start the Windows Audio service. 1  On the RD Session Host server, open the Services snap-in. 2  If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Yes. 3  In the Services pane, right-click Windows Audio, and then click Properties.