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windows 7Microsoft has already released an update (KB974431)  intended to enhance the reliability of Windows 7 and Windows Server 2008 R2  in those situations which have to do with PDF created by using 2007 Microsoft Office system document, Windows 7 Customer Experience Improvement Program (CEIP) diagnostic information settings which are configured incorrectly for Windows Explorer, problem in Windows 7 which affects the playback of certain media files in Windows Media Player etc. There is a nasty bug which has to do with this fix. Basically, while updating the system will return you with a error message (code C004F050). Let’s see how to solve and fix it and install the update. 

The error has to do with Windows 7 which can not pass genuine Windows validation (WGA). In fact, the update KB974431 embeds a check for genuineness and authenticity of Windows 7 or Windows Server 2008 R2. if such a validation doesn’t go through, the system will return you with an error. Here is the procedure to fix it:

  1. Click Start.
  2. In the Search Box, type cmd and press Enter.
  3. You will see the black windows of the Command Prompt.
  4. Type sfc /scannow
  5. If this deactivate the grace period, rearm it by using this code: slmgr /rearm
  6. Restart your computer.
  7. Try to update again.

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