http://support.microsoft.com/kb/307729 To disable balloon tips in the notification area, follow these steps: Click Start, click Run, type regedit, and then press ENTER. Locate the following subkey: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced Right-click the right side pane, create a new DWORD value, and then name it EnableBalloonTips. Double-click EnableBalloonTips, and then give it a value of 0. Close Registry Editor. [...]
