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Amazon Windows Activation

posted Nov 29, 2012, 1:20 PM by Eric Patrick   [ updated Sep 19, 2013, 5:31 AM ]
Amazon instances that were initially created outside a VPC, then migrated into a VPC, may receive 'Windows is not Activated' error messages.

To activate Windows, you should:
  • Download the latest EC2 Services
  • Run the following from an administrative command prompt:
    cscript c:\windows\system32\slmgr.vbs -skms,, or

    cscript c:\windows\system32\slmgr.vbs -ato
  • Stop and restart the EC2Services
More details are at this AWS forum post.