Windows event viewer is a pretty handy tool which can give a lot of information about what is happening in the system. It can provide information like errors, warnings and information alerts about applications and system. So if an application crashes, you can see the exact error of how and why the application crashed in the event viewer.
Windows 7 includes the reliability history monitor which can put all the information in the event log in an organized graph. To view the reliability history monitor, go to the Start Menu search and write “reliability“, select “View Reliability History“. This will open the reliability monitor with a graphical view of the event logs. It shows errors, warnings and information alerts of application and system event logs. You can click on any of the error icons in order to get the details of the error message. It will show the history of error messages occurring during a period of time.
Reliability history monitor also gives the overall stability on a scale of 1 to 10 where 10 is the most reliable.