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Windows: Determine the Last Reboot Date/Time of a Computer
 
Run the following at a command prompt:
   net statistics server
 
The second line that is returned will look something like this:
 
     Statistics since 03/08/2009 12:23:15 PM
 
which for the majority of cases* will be the server uptime.

* The value is actually the uptime of the Server service.  Unless that service has been restarted since server boot-time, which is not a common action, it will be the same as the server uptime.

Note: This command does not return correct results on Windows Server 2008 or Windows Vista.