Network Logon Will Not Remember Credentials

Windows 7 – Fixing The Mapped Drive Credentials Problem | The Gadget Grill

When you log on to a network volume and assign it as a mapped drive, there is a “Remember my credentials” checkbox on the login dialog. One would expect that this should add the login credentials to the Credentials Manager, so that the details are retained and you can automatically log in to that mapped drive the next (and every subsequent) time that you restart the Windows 7 system.

Fix is in the link.

Here is another discussion on the subject.