WiseCleaner Think Tank
Encounter difficult computer problems?
All about maintenance and optimization of your Windows System.
Apr 28, 2026
If your Windows 11 PC has been crashing, freezing, or throwing odd errors lately, you'd usually check Task Manager or Event Viewer first. Both work, but they show too much noise for a quick read. There's a quieter built-in tool called Reliability Monitor. It gives you a daily timeline of your system's stability, with each crash and warning marked on a calendar-style chart. Most people never notice it, but it's been part of Windows for years.
Press Win + S and type reliability. Click the View reliability history result. You can also press Win + R, type perfmon /rel, and press Enter. Either way the same window opens. [SCREENSHOT NEEDED: Windows search box with 'reliability' typed in and 'View reliability history' as the top result]
The main chart shows a stability index from 1 to 10, plotted day by day for the last few weeks. A red X marks an application crash. A yellow triangle means a warning, and a blue circle is an informational event, like a successful Windows update. The lower the score, the rougher that day was for your PC.
Switch between Days and Weeks at the top to zoom in or out. Click any column to see what happened that day in the panel below. [SCREENSHOT NEEDED: Reliability Monitor main view showing the stability index chart with several red X markers and the day/week toggle highlighted]
Pick a day where the score dropped, then look at the event list below the chart. Each row shows the source (often an app name or a Windows component) and a short summary. Double-click an event to open its detailed report, which may include a faulting module name or a stack hint that helps narrow down the cause. [SCREENSHOT NEEDED: Reliability Monitor with a problem report dialog open, showing the Source, Summary, and Date columns]
If you need to share what you found, click Save reliability history at the bottom. You'll get an XML file with the full timeline. That's handy when asking for help on a forum, or sending a record to your IT team. The file opens fine in any browser.
Reliability Monitor won't fix anything on its own, but it gives you a much clearer picture of when and where things went wrong. A quick weekly check is enough to spot patterns. Maybe an app keeps crashing after a certain update, or a driver throws warnings on the same day every week. It's one of those tools that's quietly useful once you know it's there.
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