Windows Server 2008R2 crash every hour

server-crasheswindows-server-2008

I have a Windows Server 2008R2 which crash every 1 hour.
The server is physical and is provided by fasthosts but I can access the server(out of the country).
So I checked for Event Viewer before crash and didn't find anything.
I checked in Task Scheduler for any task that is running every hour but again I didn't find anything.
Fasthosts console is now working at all but when the server crashes I can see a screenshot which says that there is no signal.
Any ideas what is causing that?

UPDATE:
I was connected with RDP on the server and it was starting to slow down.
Then Task Manager Hang and I wasn't able to log out or open a browser. After 1 hour I wasnt able to connect on the server

Best Answer

When a 180 day trial Windows Server 2008R2 license expires it will start rebooting every hour.

http://support.microsoft.com/kb/2021579

You should also see in your log:

Log Name:    Application
Source:      WLMS
Event ID:    100
Description: The license period for this installation of Windows
             has expired. The operating system will shut down every hour.
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