Summary: Use Windows PowerShell to determine the stability of your system.

 How can I use Windows PowerShell 4.0 on my laptop running Windows 7 to find out how stable my system is?

 Use the Get-CimInstance cmdlet to query the Win32_ReliabilityStabilityMetrics, and pipe
          the result to Measure-Object to determine the average value of the SystemStabilityIndex:

Get-CimInstance Win32_ReliabilityStabilityMetrics | measure SystemStabilityIndex -Average