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Win 7 activation

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Last Modified: 2012-05-12
I have deployed 400 computers with Windows 7, and activated them with the OEm key supplied from HP.  That was 6 months ago and everything was fine.  Now I am geting random PC's popping up say I am not running genuine microsoft.  I spent more than 4 hours on the phone with Microsoft, before they  told me to reinstall and reactivate.  Would there be a chance the activation that needs to happen every 90 days is being blocked by the firewall.  Any help would be great.  I have aobut 15 pc's with this issue.
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