To properly analyze and solve problems with Activation and Validation, we need to see a full copy of the diagnostic
report produced by the MGADiag tool (download and save to desktop -
http://go.microsoft.com/fwlink/?linkid=52012 )
Once downloaded, run the tool.
Click on the Continue button, after a short time, the Continue button will change to a Copy button.
Click on the Copy button in the tool (ignore any error messages at this point), and then paste (using either
r-click/Paste, or Ctrl+V ) into your post. (please do not edit the report.)
Please state the version and edition of windows from your COA. do not state the product key from the COA.
looks like you posted here also:
http://www.sevenforums.com/windows-updates-activation/274494-another-win-7-pro-validation-issue-0x8004fe21.html