It is a very useful tool which can record the history of our computer. The events it records such as which application and update was installed and the crash it encountered. According to the tool we can find when the computers performance is the best, since when the performance become decreased, and what the exact factor caused the decrease of the performance.

If you have never known or used the tool, its the time for you to start the new joy.

First regarding how to open the tool, we can open it through these ways:

1. Open the Action Center. Under the Maintenance section, choose view reliability history Under Check for solutions to problem reports.

2. Click Start button and then type reliability monitor or perfmon /rel in the search box.

3. Click Start button, type cmd in the search box, then type perfmon /rel at the command prompt.

Once we open the window, there will be two main sections, a chart and a detail description of the chart. As the picture displayed below.

The default displayed timeline is Days, but we can also choose the option Weeks in the left-top of the chart. The Weeks chart looks like this:

As the chart displayed, the reliability rating is from 1 to 10. The 1 means the worst reliability and the 10 is the best.

The events the tool monitored are application failures, Windows failures, miscellaneous failures, warnings and informations. There are three kinds of icons for these events, we can see it in the chart above.

Once we choose a time period, we will see a detail analysis for that time in the following section.

One line one event, the summary column is a brief description of the event, for detail, we can click view technical details in the action column. Which shows more information about the event.

For the critical event, we can click Check for a solution for the special event.

For convenient, we can click Check for solutions to all problems at the button to check solutions for all current problems.

We can also click View all problem reports at the bottom of the page to view the problems that have occurred on your PC. This view doesn't include the other PC events that appear in Reliability Monitor, such as events about software installation.

The warning session often record the installation events like update not installed successfully, so if we see the information here, we can choose to install the update manually by ourselves.

Besides the bad things, the monitor also record other normal events occurred in the computer, such as what applications we installed. These normal events will show in the information session.