Some machines require reactivation of Windows

Hello

We maintain a school network with approximately 400 computers. 2/3 are installed with Windows 7 Enterprise for which we have an educational MS-KISS license (all computers are being activated with the same MAK-key).

What happens: every now and then a computer claims it has a non-legitime windows and needs to be activated again. We then just push the Activate Now button and Windows reactivates immediately and works properly again.

I wonder why machines suddenly need a reactivation? No hardware changes where made to those machines.

Yesterday two computers needed reactivation and they showed a slightly different message: your activation period has been expired.

I hope somebody can give me some explanation or tell me how I can prevent the reactivations.

Thanks a lot.

:)

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