This tutorial will show you how to display a message on your computer before Windows XP loads.Use this trick if you want to show any message to anyone logging into your computer.
1. Go to Start->Run.
2. On the Run window type regedit and press Enter.
2.Navigate to the key HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionWinlogon.
3.Modify the key legalnoticecaption and write the name of the window you want to appear.
5.Restart your computer.
Now when your computer starts a window with the name and text defined by you will appear on the screen before Windows XP is loaded.