If you wish to disable the Windows XP Tool Tips:

1. Copy / Paste the following to a NoTT.reg file:

REGEDIT4

\[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\]
"ShowInfoTip"=dword:00000000

2. Merge the NoTT.reg file with the registry or run regedit /s NoTT.reg.

3. The use must log off and on for this setting to take effect.