V případě, že chce vypnout komplet všechny balloon tool tipy :

Press Windows+R, enter gpedit.msc and hit enter. This opens the Group Policy Editor. Please note that the Group Policy Editor (gpedit.msc) is not available in Windows Vista Home and Vista Home Premium. I’m going to outline how to disable balloon tips on those editions at the end
Go to User Configuration, Administrative Templates, Start Menu and Taskbar.
Select Remove Balloon Tips, right-click it and choose properties from the context menu
Select Enable from the options and click ok
Close the Group Policy Editor
Reboot Windows Vista

As I said earlier gpedit.msc is not available in Windows Vista Home and Home Premium which means that we have to rely on the registry to disable those annoying balloon tips in Windows Vista.

Press Windows+R, type regedit and hit enter. This starts the registry editor
Navigate to HKEY_CURRENT_USER / SOFTWARE / Microsoft / Windows / CurrentVersion / Explorer / Advanced
Create a new Dword and name it EnableBalloonTips
The value should be automatically set to 0, if it is not change it to 0
Reboot Windows Vista