Instructions:

  1. Press "Start" button
  2. Click "Run..."
  3. Type "regedit" + press enter
  4. Navigate to "HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Advanced"
  5. Create or modify "EnableBallonTips" (DWORD value)
    0 = Notification tips disabled
    1 = Notification tips enabled
  6. Exit registry

Restart computer