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Usually Windows shows SPX on the System Information screen - is that the case for Windows Server 2008 R2? Is this a reliable way to verify whether or not SP1 is installed on this machine?

Windows Server 2008 R2

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WinKey+R, enter winver It will print Version 6.1 (Compilation 7601: Service Pack 1)

And no, your installation doesn't have SP1 installed (it adds a 3rd line to version section)

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5

The command winver will give you What you need.enter image description here

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