Reliability Monitor: a timeline of every crash and failed update — via Microsoft Learn

Commandlow riskWindows 11Windows 10

Reliability Monitor draws a day-by-day chart of app crashes, Windows errors, failed updates and installs, with details for each. It's the quickest way to answer 'what changed right before my PC started acting up?'

Takes effect right away

The easy way

  1. Run the command (or press Win + R and type it).
  2. Click a day with a red ✕ to see what failed, then double-click an entry for technical details.

Command

Run in a normal Command Prompt / Terminal window.

perfmon /rel
It only reads Windows' own logs and changes nothing.

Sources

Source reviewed
2026-11-02
Link checked
2026-11-02
Tested hands-on
Not by Oddbyte.Me

Oddbyte.Me hasn't tried this on every Windows build, so keep the undo handy.

reliability monitorcrashesperfmontroubleshootinghistory

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softwareupdate can list and download complete macOS installers, including older versions Apple still serves. Useful for making a bootable USB installer or installing on another Mac without hunting through the App Store. This entry only downloads; it doesn't install anything.