Here's how to disable them.
Warning: You'll need to access Windows Registry. ALWAYS backup your registry FIRST! Don't proceed if you don't know how/why to do that.
- Launch regedit (Start -> Run -> regedit)
- Find the key HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- Set ShowInfoTip value to 0
- Exit regedit
- Restart computer.