Event Log ? What am I looking for ?

Applications log messages in the Application log.
The system and system services log messages in the System log.
You can easily check the System log for the times the system restarted.
Every time a system reboots, 2 entries are made in the System log with a Source of EventLog. Filter by clicking View | Filter and set the Event source: to EventLog
The first will be:

Event Type: Information
Event Source: EventLog
Event Category: None
Event ID: 6009
Date: 5/11/2009
Time: 6:02:10 PM
User: N/A
Computer: PCName
Description:
Microsoft (R) Windows (R) 5.01. 2600 Service Pack 2 Multiprocessor Free.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Click to expand...

And this is the second:

Event Type: Information
Event Source: EventLog
Event Category: None
Event ID: 6005
Date: 5/11/2009
Time: 6:02:10 PM
User: N/A
Computer: PCName
Description:
The Event log service was started.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Click to expand...

The Description will be your OS of course.

You can also uncheck Information in the Filter options under Event Types to only display Error and Warning messages.

HTH

Jerry