Herre is the process for XP
http://support.micro...scid=kb;en-us;3077291. Click Start, click Run, type regedit, and then press ENTER.
2. Navigate to the following subkey:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
3. Right-click the right pane, create a new DWORD value, and then name it EnableBalloonTips.
4. Double-click this new entry, and then give it a hexadecimal value of 0.
5. Quit Registry Editor. Log off Windows, and then log back on.
These steps disable all Notification Area balloon tips for this user. There is no way to disable balloon tips for specific programs only.