Hi,
Your grand daughter must have saved her Passport.Net password on your
machine.
To get rid of that entry go to your Start -> Control Panel -> User Accounts.
Then click on your user account and then on the top left corner there'll be
an option called Manage my network passwords.
Click on that and then you'll see a list of stored usernames and passwords.
Select your grand daughter's accounts and any other accounts you might not
want and then click on the remove button. Then click on Close.
Now if you want to remove Windows Messenger
Go to the below website for the steps.
To Prevent Windows Messenger from Running on a Windows XP-Based Computer
http://support.microsoft.com/default.aspx?scid=kb;en-us;302089&Product=WinMsgr
When you do this your Windows Messenger won't show up in your taskbar
anymore
However if you want to completely remove/uninstall Windows Messenger from
Windows XP can be found at this website made by Jonathan Kay.
http://messenger.jonathankay.com/problem.aspx?ID=7
Follow the steps and the pictures that the website has and you shouldn't
have anymore problems. Uninstalling Windows Messenger can disable some of
the messenger features such as Whiteboard Sharing, and others on MSN
Messenger if you're using that.