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Windows Live Messenger Error 81000490

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Here is a great post on how to resolve an error in Windows Live Messenger when it suddenly stops signing in. 

https://ee61re.wordpress.com/2010/12/14/unable-to-sign-in-to-windows-live-messengererror-81000490/

Delete the C:\users\<username>\AppData\Local\Microsoft\Windows Live\Contacts\<Windows Live ID> folder and then try signing in again.