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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.
You may have to be signed in as admin, I'm not sure. Don't mess around too much in the registry because if you do something wrong it can severely damage your system. To be sure make a backup of data of your comp before trying this.
Enjoi