Manage stored passwords
You can delete or change the passwords that you store on your computer.
Open User Accounts by clicking the Start button , clicking Control Panel, clicking User Accounts and Family Safety (or clicking User Accounts, if you are connected to a network domain), and then clicking User Accounts.
In the left pane, click Manage your network passwords.
Select the password you want to manage.
Click Edit, make the change you want, and then click OK.