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How can I verify the signatures and document's data integrity?
How to install Root Certificates with: Windows XP | Windows Vista | Windows 7 Enable Adobe Reader to Verify Digital Signatures.
So you have a computer with Windows 7 installed, but you’re not sure if you are running a genuine version of the OS.
You may have this issue if you downloaded a copy of Windows 7 or if someone installed it for you.
Either way, there are a couple of different ways to check and make sure that your Windows 7 copy is genuine.
Then scroll all the way down to the bottom and you should see a section called Windows activation, which says “Windows is activated” and gives you the Product ID.