The Reliability Monitor is intended for advanced computer users, such as software developers and network administrators. Reliability monitor was introduced first in Windows Vista as “Reliability and Performance Monitor”. Now it has been tear-off and independent from Performance Monitor. The purpose of reliability monitor is to graphically plot the stability index and display the hardware and software failures and other core information from the system (such as application installation and removal etc.), which affects the stability of the machine.
You can see that Safari and other application has crashed many times and also the I’ve got some some warnings when I tried uninstalling the beta version of office 2010. The list also contains the programs I uninstalled.
Click Maintenance. Then, under Check for solutions to problem reports, click View reliability history.
In Reliability Monitor, you can:
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Click any event on the graph to view its details.
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Click Days or Weeks to view the stability index over a specific period of time.
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Click items in the Action column to view more information about each event.
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Click View all problem reports to view only the problems that have occurred on your computer. This view doesn’t include the other computer events that show up in Reliability Monitor, such as events about software installation.
You can see more details in Microsoft website.

