Anybody else encounter the problem that when connected to a Windows 2008 server via MSTSC (Remote Desktop/Terminal Services) any dialog box causes your local machine to beep? I didn’t help to switch off sound in the MSTSC settings or anything. It not only drove me crazy but I’m sure my office colleagues will agree a fix was way overdue.

The quick way, just run “net stop beep” on your LOCAL machine (not the server).

This technet article explains the way to disable it permanently.