There are two ways to disable Windows XP Balloon Tips. One, you can go here and download Microsoft's PowerToys.
Once you have it installed, go to Taskbar and uncheck "Enable Balloon Tips."
Two: You can perform a registry tweak to the same end.
To open up the registry editor:
1. Click on Start
2. Choose Run
3. Type in "regedit"
4. Click Okay
Follow this path to The Key:
Create a new DWORD value, name it EnableBalloonTips, and set it equal to 0. If EnableBalloonTips is already there and equal to 1, set it equal to 0. Quit the registry editor, log off, and log back on. Voila! Your computer will stop talking down to you.