how to clear/manage remembered passwords on windows

How to Manage Stored User Names and Passwords

NOTE If you use an administrative account to log on the computer, follow these steps:

1. Click Start, and then click Control Panel.
2. In Control Panel, click User Accounts under Pick a category to open the User Accounts dialog box appears.
3. On the Users tab, click the user that you want, and then click the Advanced tab.
4. Click the Manage Passwords button to open the Stored User Names and Passwords dialog box. A list of stored user names and passwords similar to the following may appear:
   *.Microsoft.com
   Passport.Net\*(Passport)

If you use a restricted user account to log on the computer, follow these steps:

1. Click Start, click Run, type Control Userpasswords2, and then press ENTER.
   
   Note The following message may occur:
   You must be a member of the Administrators group on this computer to open User Accounts. You are logged on as user name, and this account is not a member of the Administrators group.
   In this condition, you are required to type the user name and password when the system prompts the dialog box to type the user name and password of the administrator of the computer.
2. Click the Advanced tab, and then click Manage Passwords.

To Add an Entry

1. In the Stored User Names and Passwords dialog box, click Add to open the Logon Information Properties dialog box.
2. In the Server box, type the name of the server or share that you want. You can use an asterisk as a "wildcard" character. The following example entries are valid server names:
   *.Microsoft.com
   \\Server\Share
3. In the User name box, type the name of the user account that has permission to access the resource. Type the user name in the Server\User or User@domain.com name format. The following are examples of valid user name entries:
   Microsoft\User
   User@microsoft.com
4. In the Password box, type the password for the user that you entered in step 3, and then click OK.
5. In the Stored User Names and Passwords dialog box, click Close.

To Remove an Entry

1. In the Stored User Names and Passwords dialog box, click the credential that you want, and then click Remove. The following message is displayed:
   The selected logon information will be deleted.
2. Click OK.
3. In the Stored User Names and Passwords dialog box, click Close.

To Edit an Entry

1. In the Stored User Names and Passwords dialog box, click the credential that you want, and then click Properties. The Logon Information Properties dialog box is displayed.
2. Change the items that you want, and then click OK.
   
   If you want to change the domain password for the user account that is specified in the User namebox, click Change. Type the old password and new password into the corresponding boxes, type the new password into the Confirm new password box, and then click OK. The domain password is changed.
3. In the Stored User Names and Passwords dialog box, click Close.

reference: http://support.microsoft.com/kb/306992