Create Your Own Logon Message

You can create a message that will appear when you log on to your computer.
Click Start, click Run, type regedit, and then click OK.

In the Registry Editor, drill down to the following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

Right-click LegalNoticeCaption, click Modify, type My Windows XP Machine, and then click OK.

Right-click LegalNoticeText, click Modify, and then type your message.

Close the editor and your new message will appear at every log on.

This tip applies to computers that are part of a domain. For stand-alone or peer-to-peer networks, the custom screen appears just before the Welcome screen.

You may need to have an administrator account on your computer to make changes to the registry. Incorrectly editing the registry may severely damage your system. At the very least, you should back up any valued data on the computer before making changes to the registry.

Enjoy