Windows 11 Troubleshooting: A Step-by-Step Repair Ladder

Good Windows 11 troubleshooting is mostly about order. Most people jump straight to the drastic fixes, such as resetting the PC, when a restart, a pending update or a five-minute repair command would have solved the problem without touching their apps or files. This hub sets out a repair ladder: start at the bottom rung, test, and only climb to the next rung if the problem is still there. Each rung links to a full guide.

The steps apply to Windows 11 version 24H2 and 25H2. Version 25H2 was delivered as an enablement package on top of 24H2, so the menus are the same on both. Where Home and Pro differ, we say so.

Before you start: two minutes of preparation

A few habits make every later step safer:

• Back up anything you cannot lose. Copy important files to an external drive or a cloud folder. Most repairs keep your data, but a backup turns a bad day into a minor one.
• Find your BitLocker recovery key. Many Windows 11 laptops have device encryption or BitLocker turned on by default. Startup Settings, System Restore from recovery, and Reset this PC from recovery can all ask for the 48-digit key. See our guide to the BitLocker recovery screen for where the key is usually stored.
• Write down what changed. A new driver, a new app, a Windows update, a new USB device: the last change before a problem is the most likely cause.

Rung 1: Restart properly and install updates

Use Start > Power > Restart rather than Shut down. A restart always performs a full reload of the Windows kernel and drivers, which clears many stuck states.

Then open Settings > Windows Update and select Check for updates. Install everything offered, restart again, and look under Settings > Windows Update > Advanced options > Optional updates for driver updates from your PC maker. If updates themselves are the problem, read Windows 11 update stuck or Windows 11 update failed before going further.

Rung 2: Run the built-in troubleshooters

Windows 11 still has targeted troubleshooters. Go to Settings > System > Troubleshoot > Other troubleshooters and select Run next to the one that fits, for example Windows Update, Network and Internet, Audio, Bluetooth or Printer. Many of these now open the Get Help app, which runs the diagnostics and walks you through the suggested fixes.

Troubleshooters are quick and change nothing you would not want changed, so they are worth running even if you doubt they will help. For specific symptoms, our dedicated guides go further:

• Windows 11 no internet and Wi-Fi keeps disconnecting
• Windows 11 Bluetooth not working
• Windows 11 audio not working
• Windows 11 Start menu not working and taskbar not working
• File Explorer crashing

Rung 3: Repair system files with DISM and SFC

If Windows features fail in odd ways, apps crash without a clear reason, or updates keep failing, corrupted system files are a real possibility. Windows includes two repair tools that work as a pair:

1. DISM checks and repairs the component store, the cache of known-good files that Windows uses for repairs. Run DISM.exe /Online /Cleanup-image /Restorehealth from an administrator Command Prompt. Full walkthrough: DISM RestoreHealth.
2. SFC compares protected system files against that store and replaces bad copies. Run sfc /scannow after DISM finishes. Full walkthrough, including how to read the log: sfc /scannow.

Microsoft recommends running DISM first, because SFC repairs files by copying them from the store DISM has just checked.

Rung 4: Safe mode and clean boot

These two tools answer one question: is Windows itself broken, or is something you installed interfering?

Safe mode starts Windows with a minimal set of drivers and services. If the problem disappears in safe mode, the cause is very likely a driver, a startup app or third-party software. Our Windows 11 safe mode guide covers every way in, including from the sign-in screen and when Windows will not start.

Clean boot is gentler. You start Windows normally but with all non-Microsoft services and startup apps turned off, using System Configuration (msconfig) and Task Manager. Then you turn items back on in halves until the problem returns. That isolates the exact app or service at fault. Our guide to startup apps shows where to manage them afterwards.

Blue screens and crashes often trace back to a driver found this way. See Windows 11 blue screen and our graphics drivers guide.

Rung 5: Undo recent changes

If the problem started on a specific day, undo what changed that day:

Tool	What it undoes	Keeps your files?
Uninstall updates	A recent quality update	Yes
Roll back driver (Device Manager)	The last driver update for one device	Yes
System Restore	System files, settings and installed programs since a restore point	Yes
Point-in-time restore (24H2 and later, where available)	The whole PC, including files, to a recent automatic snapshot	No, changes after the snapshot are lost

To remove an update, go to Settings > Windows Update > Update history > Uninstall updates. Our guide to Windows 11 slow after an update covers this in detail. For System Restore, see Windows 11 System Restore; it only works if restore points were being created before the problem started.

Rung 6: Reinstall Windows without losing apps

Windows 11 has a recovery option that many people overlook. Go to Settings > System > Recovery and, under Fix problems using Windows Update, select Reinstall now. Windows downloads a repair version of your current Windows build and installs it in place. According to Microsoft, this reinstalls the same version, repairs system files and components, and preserves your apps, files and settings.

Keep the PC plugged in and online for the whole process. The option can be missing on PCs managed by a work or school, and on older Windows 11 builds.

Rung 7: Reset this PC

When nothing else works, Reset this PC reinstalls Windows from scratch. You choose Keep my files or Remove everything, and Cloud download or Local reinstall. Either way, your installed apps and settings are removed, so make a list of what you need to reinstall first.

If you cannot even reach the desktop, the same option is available from the Windows Recovery Environment under Troubleshoot > Reset this PC. A PC caught in a restart cycle often lands there automatically; see Windows 11 boot loop.

When it is probably hardware

Software fixes cannot repair failing hardware. Suspect hardware when:

• The fault appears before Windows loads, such as no picture at power-on (no display on boot) or a PC that will not turn on.
• The PC shuts down at random, especially under load or when warm. Check for overheating and blocked vents.
• Blue screens name different drivers each time, or you see memory-related stop codes. Run Windows Memory Diagnostic.
• Your drive disappears or makes noises (SSD not detected).
• The problem survives a full Reset this PC with Remove everything.

At that point, run your PC maker’s built-in hardware diagnostics, which most manufacturers provide from the firmware or a startup key, and contact the maker if the PC is under warranty.

Quick reference: which fix for which symptom

Symptom	Start with
Update will not install or stalls	Update stuck, then Fix problems using Windows Update
Blue or black stop-code screen	Blue screen guide, safe mode, driver rollback
Everything is slow	Slow performance, 100% disk usage
Slow only since an update	Slow after update
Network, Bluetooth or sound gone	Matching troubleshooter, then the device guide
Strange errors everywhere	DISM, then SFC
BitLocker key prompt at startup	BitLocker recovery
An app is frozen or the fan is racing	Task Manager in Windows 11
Drive errors or “scan and fix” messages	CHKDSK in Windows 11
Need to change boot order, Secure Boot or TPM	BIOS UEFI settings

Work through the ladder in order, test after each rung, and you will usually fix the problem long before you need to reset anything.

A slow spinning hard drive? Check scheduled optimization with our guide to defragment a hard drive in Windows 11.