If your Windows PC has been:

freezing randomly
crashing during normal use
slowing down for no reason
losing internet access
or just acting unstable lately

…you may not need to reinstall Windows or download another “PC cleaner” app.

Windows already includes several powerful built-in repair tools that can fix many common issues entirely on their own. And surprisingly, most people never use them.

Some of these commands can:

repair corrupted system files
fix broken networking
Check SSD or hard drive health
Identify battery drain problems
and even detect faulty RAM

Before using any of them, open Command Prompt properly:

Open the Windows search bar
Type cmd
Right-click Command Prompt
Choose Run as administrator

Also Read How To Run Windows 10/11 on Android Phone with Chrome!

Now let’s go through the most useful ones.

1. Update All Installed Apps at Once

One of the most overlooked causes of Windows problems is outdated software.

Apps can conflict with each other, break compatibility, or cause stability issues if they haven’t been updated properly. Windows includes a package manager called Winget that can update supported apps automatically.

Type:

winget upgrade --all

This command checks for available updates and installs them automatically.

You can also preview available updates first:

winget upgrade

This is especially useful for:

browsers
media apps
developer tools
utilities
and many third-party applications

Winget is officially developed by Microsoft and is included in modern versions of Windows 10 and Windows 11 through App Installer.

2. Repair Corrupted Windows System Files

If Windows files become damaged, strange issues can start appearing:

crashes
missing functions
startup problems
random instability

The System File Checker scans protected Windows files and replaces corrupted ones automatically.

Run:

sfc /scannow

The scan may take several minutes.

You’ll usually see one of these results:

No integrity violations found
Corrupted files repaired
Some files could not be repaired

If Windows says it could not repair everything, the next command becomes important.

Microsoft officially recommends SFC for repairing corrupted Windows system files.

3. Repair the Windows Image Store With DISM

Sometimes SFC fails because the backup files Windows relies on are also corrupted.

That’s where DISM comes in.

DISM repairs the Windows image itself and can download clean files directly from Microsoft servers.

Run:

DISM /Online /Cleanup-Image /RestoreHealth

This can take:

10 minutes
20 minutes
or sometimes longer

After it finishes:

Restart your PC
Run sfc /scannow again

These two tools work best together.

Microsoft officially documents DISM as a recovery tool for corrupted Windows images and servicing issues.

4. Scan Your Drive for Errors and Bad Sectors

If your PC:

freezes frequently
corrupts files
becomes extremely slow
or struggles during boot

…your drive may have file system errors or damaged sectors.

CHKDSK scans the drive and attempts repairs automatically.

Run:

chkdsk /r

Because Windows uses the system drive, it will usually prompt you to schedule the scan for the next restart.

Press:

…and reboot the PC.

Important: Modern SSDs generally don’t benefit from excessive CHKDSK usage the same way older hard drives did, so this tool is best used when actual problems appear rather than constantly running it.

5. Fix Strange Internet Problems

Sometimes your internet appears connected, but:

Websites refuse to load
Pages load incorrectly
Or apps suddenly lose access

Windows stores DNS information locally, and corrupted or outdated entries can cause problems.

First run:

ipconfig /flushdns

Then:

ipconfig /release

And finally:

ipconfig /renew

This combination:

clears DNS cache
drops the current IP
requests a fresh network configuration

Honestly, this fixes a surprising number of “internet is connected but broken” situations.

6. Completely Reset Windows Networking

If basic internet fixes don’t help, Windows networking itself may be corrupted.

These commands reset the network stack and Winsock configuration.

Run these one at a time:

netsh winsock reset

netsh int ip reset

netsh int tcp reset

Afterward:
Restart your PC.

This can help fix:

random disconnects
broken downloads
apps refusing internet access
corrupted TCP/IP settings

Microsoft still documents netsh winsock reset as a valid repair step for certain network problems in Windows.

7. Check SSD or Hard Drive Health

Modern drives monitor their own health internally.

Windows PowerShell can display that information directly.

Run:

powershell "Get-PhysicalDisk | Format-Table FriendlyName, MediaType, HealthStatus, OperationalStatus"

You’ll see:

drive type
health status
operational condition

If a drive reports anything other than “Healthy,” back up important data immediately.

Important! This method provides a quick health overview, but it may not detect every failing SSD or hard drive. Dedicated SMART tools from manufacturers can sometimes provide more detailed diagnostics.

8. Find and Force-Close Problematic Apps

Sometimes an app silently consumes:

RAM
CPU
or disk usage

…and slows the entire PC down.

Run:

tasklist

This shows all active processes and their memory usage.

If an app freezes or refuses to close:

Find its PID number
Run:

taskkill /PID NUMBER /F

Replace NUMBER with the actual process ID.

You can also close apps by name:

taskkill /IM appname.exe /F

Useful when the Task Manager itself becomes unresponsive.

9. Generate a Hidden Windows Battery and Power Report

Laptop battery problems are often caused by:

bad drivers
power settings
USB wake issues
background devices

Windows includes a surprisingly detailed hidden energy report tool.

Run:

powercfg /energy

Windows monitors the system for about 60 seconds and then generates an HTML report.

The report can reveal:

devices preventing sleep
battery drain issues
problematic drivers
inefficient power settings

For laptop users, this tool is honestly extremely useful.

It is an official Microsoft Power Diagnostics utility included in Windows.

10. Check Your RAM for Hidden Problems

Faulty RAM can cause:

random crashes
blue screens
corrupted files
apps closing unexpectedly

And many people never realize that memory is the real issue.

Windows includes a built-in memory tester:

Open Start
Type:

mdsched

Choose:

restart immediately
or
schedule for next boot

Windows will test your RAM before startup.

If errors appear, the issue is likely hardware-related rather than Windows itself.

These Tools Are Already Built Into Windows

A lot of people immediately:

reinstall Windows
Buy “PC repair” software
or assume their system is permanently broken

But honestly, Windows already includes several powerful recovery and diagnostic tools that can solve many common problems without installing anything extra.

And while these commands will not magically fix every issue, they are often the fastest place to start before taking more drastic steps.