A couple of different ways depending on what version of windows you have.
Windows 8 and 8.1
[You must be registered and logged in to see this link.]In credential manager you have to use your Microsoft outlook.com password. (That is your first password that was asked to setup your new windows 8.) Not your Administrative password to log into Windows.
Windows Vista- you go to internet explorer tools -http://windows.microsoft.com/en-us/windows-vista/manage-stored-passwords
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