Removing a Passport (including dropdown list in Messenger) from your Windows XP Account
||Solve a Messenger problem
Solve ID: 2
Click the Start Button, then click the Control Panel.
Click User Accounts in the Control Panel.
Click your Account Name.
On the left side of the screen, under Related Tasks, click 'Manage my Network Passwords'.
To delete your assigned passport, click the passport account -- ones marked (Passport), and click the Delete button.
This should solve your problem. Return to the list of problems.