WIndows 7 Pro losing Activation all of a sudden?

We have two users, both using the same type of laptop- an HP Elitebook 8460p, that suddenly after many months/years of use are getting a pop up that 'Windows could not be activated'.  

One of the machines also threw the error 'They KeyManagement Service does not have enough computers registered at this time.'  I don't know what this even means- we do not have any volume licensing for Windows.  We have many (about 80) of these 8460P laptops in circulation since 2013 and all of them had Windows 7 Pro pre-installed on them when we bought them.

What would cause this to happen, all of a sudden,  to two of them ?
Windows Activation Error DialogVolume activation service failure
snyperjAsked:
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Adam LeinssConnect With a Mentor Senior Desktop EngineerCommented:
Did you buy these from a major vendor or some garage guy?  Can you run slmgr /dlv from a command prompt and give us the output?
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snyperjAuthor Commented:
They were bought from reputable vendors online.
Below are the results from both computers exhibiting the problem:
Comouter 1 (bb)Computer 2 (ms)
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Adam LeinssSenior Desktop EngineerCommented:
OK, so it says it's licensed, so that's good...yet it says it's unactivated?  Maybe try running slmgr /ato from the command line and then restart and re-check it.
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KimputerConnect With a Mentor Commented:
In case you did NOT do anything out of the ordinary (maybe the control panel / system / shows "Window is activated"), then it could be the fault of this Windows Update:  KB3004394
Check to see if it's installed, then uninstall it.
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☠ MASQ ☠Connect With a Mentor Commented:
Can you show the additional detail in the first message? What we're looking for is an 8 digit error code from the activation server)

There are a few scenarios that come to mind.

The most likely is you've recently installed something that has broken WGA (the activation checking software), chances are if nothing immediately comes to mind it's a Windows Update that has done this.

Possible but at the other end of the spectrum is you were sold machines with licencing errors.

I'm assuming that you don't use key activation - (your network includes a machine acting as a dedicated licencing server)

Could they be OEM installs (i.e. the Windows install was provided by HP on purchase)?
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snyperjAuthor Commented:
We don't do key activation on our network, no.   I just had another user report they are receiving the 'The Key Management Service does not have enough computers registered at this time.." error.  This is not an HP Elitebook 8460p, but another HP model altogether.  As I mentioned before - we do buy these laptops with Win 7 Pro already installed... and we then install Office 2010 Standard and activate it online with Microsoft...  is that somehow related?
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snyperjAuthor Commented:
..but again, just to reiterate, these computers just suddenly started doing this.  They have all been with users for 1 year or more.
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jcimarronConnect With a Mentor Commented:
snyperj--
Key Management Service allows the MS licenses to be renewed from time to time.
See KMS Overview here.
https://technet.microsoft.com/en-us/library/ee939272.aspx

The discussion here may also help you understand KMS. You need more than 25 PC's to be active for KMS to work.
https://social.technet.microsoft.com/Forums/windowsserver/en-US/90dd1f5e-e709-4b4d-9a53-fc6743262830/the-key-management-service-does-not-have-enough-computers-registered?forum=winservergen
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☠ MASQ ☠Commented:
Need to check if you have OEM systems

Can you download and run this tool on a machine that shows as could not be activated and one with the Key Management Server error.

http://go.microsoft.com/fwlink/?linkid=52012

In both cases the tool will generate a text output, could you post them both here?
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KimputerCommented:
So did you try to uninstall  KB3004394 yet? It's a known buggy update that causes different types of activation/not genuine errors.
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snyperjAuthor Commented:
I split the points and I thank everyone who assisted.  The cause was something I did not even mention because at the time did not think of it.  Users connect to Citrix XenAPP servers for business applications.  The Windows 2008 o/s on the servers is controlled by KMS.  There was actually an issue with that process and that was the activation error they were seeing..(inside their citrix sessions.)   Thanks again!
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jcimarronCommented:
snyperj--Thanks for telling us the problem.
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