Black screen instead of my desktop

I installed and activated Windows 7 without problem a few weeks ago. I did an update and now a black screen appears instead of my desktop and I get this message: your version of windows is not valid (key). I bought this product legally, does anyone have a solution?

Windows 7 displays "Windows is not genuine" with the code error 0x80070005:
http://support.Microsoft.com/kb/2008385/en-us ~ Robear Dyer (PA Bear) ~ MS MVP (that is to say, mail, security, Windows & Update Services) since 2002 ~ WARNING: MS MVPs represent or work for Microsoft

Tags: Windows

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