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Cannot Delete Saved Password or Error 5: Access is denied
http://www.vistaarticles.com/articles/250/1/Cannot-Delete-Saved-Password-or-Error-5%3A-Access-is-denied
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Published on 12/10/2006
 
An updated password is not saved.

Cannot Delete Saved Password or Error 5: Access is denied

To work around this problem, follow these steps:1. Click Start, type network and sharing in the Start Search box, and then click Network and Sharing Center in the Programs list.

 If you are prompted for an administrator password or confirmation, type your password or click Continue. 
2. In the Tasks pane, click Connect to a network, click the network connection that you want to configure, and then click Connect.
3. In the Connect NetworkName dialog box, click [To change the saved password, click here], and then type the updated password.
4. Click to select the Save this user name and password for the following users check box, click Anyone who uses this computer, and then type an administrator password or click Continue when you are prompted for an administrator password or confirmation. 
5. Click Connect.