How can I tell if SP1 is installed on Windows Server 2008 R2 Standard? [closed]

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I've been given access to a server and told SP1 was installed on it, but I think maybe it wasn't. How can I check if Service Pack 1 is installed on Windows Server 2008 R2?

What I've tried:

If I right click Computer, then click Properties, it says "Windows Server 2008 R2" under Windows Edition. I would expect it to say "Windows Server 2008 R2 Service Pack 1" if it was installed, but I did find something in a Windows 7 forum about the Service Pack not showing up in computer properties.

If I click Control Panel - > Programs - > View Installed Updates, it's not there either. I don't see the words "Service Pack" or any reference to KB 976932, which I believe is the KB for Service Pack 1 for Server 2008 R2 as well as Windows 7. (Maybe I'm wrong?)

If I run msinfo32, it shows Version as 6.1.7600 Build 7600

If I call ver.exe from command prompt it says Microsoft Windows [Version 6.1.7600]

Is there any other way to verify if SP1 is installed? Or, could I prove it is NOT installed?

UPDATE: Maybe someone can move this to Server Fault?

Here's the explanation I received: "The Windows Server 2008 R2 w/sp1 is from our Microsoft download, and the key used only works on that download" Is this normal/expected behavior for a MSDN download?

Answer 1

Go to start > run and type winver. Hit enter and a dialog will appear. On the second line in the main dialog body, you will either see something like this:

Microsoft Windows [Version 6.1.7600]

Or, if SP1 is installed you will see this:

Microsoft Windows [Version 6.1.7600: Service Pack 1]

If a service pack is properly installed, it will always appear in the winver dialog, so it's absence is proof that it is not installed, or is corrupted in some way.