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Windows Diagnostic Tools

Tools for checking CPU, memory, storage, processes, startup, logs, hardware and performance.

Start with the built-in tools, which are often enough, then use specialised utilities for more detail.

CPU and system information

Details of processor, motherboard and system.

  • System InformationBuilt into Windows

    Check hardware, drivers and system configuration in one place.

    Open:msinfo32

    All versions of WindowsMicrosoft documentation

  • CPU-Z

    Shows detailed information about your processor, memory and motherboard.

    FreeWin / Android

  • HWiNFO

    In-depth hardware information and live sensor monitoring.

    FreeWin

Memory

Test memory and see how it's used.

  • Windows Memory DiagnosticBuilt into Windows

    Check whether faulty memory is causing crashes. Runs after a restart.

    Open:mdsched

    All versions of Windows

  • RAMMap

    Analyses how physical memory is used.

    FreeWin

Storage

Check drive health and performance.

  • chkdskBuilt into Windows

    Find and fix file system errors. Back up important files before repairing a failing drive.

    Command Prompt or PowerShell:chkdsk C:

    All versions of WindowsMicrosoft documentation

  • CrystalDiskInfo

    Checks the health and temperature of your hard drives and SSDs.

    Open SourceWin

  • CrystalDiskMark

    A storage benchmark for Windows.

    Open SourceWin

Processes and performance

See what's using CPU, memory, disk and network.

  • Task ManagerBuilt into Windows

    See what's using CPU, memory, disk and network, and manage startup apps.

    Open:taskmgr (or Ctrl+Shift+Esc)

    All versions of Windows

  • Resource MonitorBuilt into Windows

    Find which process is using disk or network, and which files it's accessing.

    Open:resmon

    All versions of Windows

  • Performance MonitorBuilt into Windows

    Record performance data to investigate slowdowns.

    Open:perfmon

    All versions of Windows

  • Process Explorer

    A detailed replacement for Task Manager.

    FreeWin

Startup

Review programs that start automatically.

  • Task ManagerBuilt into Windows

    See what's using CPU, memory, disk and network, and manage startup apps.

    Open:taskmgr (or Ctrl+Shift+Esc)

    All versions of Windows

  • Autoruns

    Shows everything that starts automatically on Windows.

    FreeWin

Logs and reliability

Event logs and reliability history.

  • Event ViewerBuilt into Windows

    Investigate errors, crashes, sign-ins and service failures.

    Open:eventvwr.msc

    All versions of Windows

  • Reliability MonitorBuilt into Windows

    See when problems started and what changed around the same time.

    Open:perfmon /rel

    All versions of Windows

System file repair

Check and repair Windows system files.

  • System File CheckerBuilt into Windows

    Repair damaged Windows system files. Run from an administrator terminal.

    Command Prompt or PowerShell:sfc /scannow

    All versions of WindowsMicrosoft documentation

More Windows tools