"My Documents" Folder opens by itself at Startup! How to fix?

[AWS]

I am running Windows 8 Pro RTM, activated and updated. Last week suddenly it startet, that everytime Windows 8 starts it opens the "My Documents" Folder by its own and so switching to the Desktop. It is really anoying.
I made a full fresh Install of Windows 8 in hope this issue will vanish, but after login in (synchronizing) with my Microsoft Accout the issue was back.
Any ideas?

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