How long should I wait before I switch the computer off?

Larger updates can take a long time, and the screen may sit at one percentage for a while. Give it a generous period, up to an hour or two for a big update, and watch for disk activity. Only force a shutdown if there has been no sign of life for hours.

Will I lose my files if I restart during an update?

Updates are designed to roll back safely, but interrupting one is a risk. That is why you back up important files before updating, and why you should avoid forcing a shutdown unless you must.

What do SFC and DISM do?

They are built-in tools that check and repair Windows system files. You run them from a command prompt opened as administrator. They take time, and they are used after the simpler steps fail.

Yes. Windows lets you pause updates for a period. Pausing is useful if an update causes trouble, but security updates matter, so resume updating when you can.

The same error code keeps coming back. What should I do?

Search for the exact code together with your Windows version. Microsoft's support pages and community answers often explain that specific code, and the troubleshooter or a manual download of the update may fix it.

Windows Update Stuck or Failed? What to Do, from Waiting to Repair Tools

Written by the Yorozuya IT editorial team, based in Japan. Last updated above. Menus, apps, and rules change, so check the date.

The progress screen says 30 percent. An hour later it still says 30 percent. Or the update fails and Windows says it will try again. It is natural to panic and hold the power button. In most cases, patience and a short checklist fix it.

First: wait longer than feels natural

Windows updates do not progress smoothly. A number can sit still for a long time while the computer is working on something heavy in the background. If the drive light or the fan is active, it is probably still working.

Give it time. For a large update, allow an hour or two before worrying.
Keep the computer plugged in. Do not run it on a low battery.
Avoid forcing a shutdown unless it has clearly stopped for hours.

The steps, in order

Five steps for a stuck Windows update: wait, restart, make room, run the troubleshooter, use the repair tools

1. Wait, then restart if it is truly stuck

If there is no sign of activity for several hours, restart the computer. Windows will usually either finish or roll back the update. Then open Settings, Windows Update and try again.

2. Make room and unplug extras

Free disk space. Monthly updates need several gigabytes, and big feature updates need more. Delete unneeded files, empty the recycle bin, and run Storage settings.
Unplug non-essential devices, such as external drives, USB hubs, printers, and memory sticks, and try the update again.
Disconnect from a VPN during the update if you use one.

3. Check the basics

Date and time should be correct and set to automatic.
Restart pending from an earlier install can block a new one. Restart first.
Internet connection should be stable. A weak Wi-Fi link can cause failed downloads.

4. Run the built-in troubleshooter

Open Settings, System, Troubleshoot, Other troubleshooters and run the Windows Update troubleshooter. It resets some update components and often clears the problem. Menu names change between Windows versions, so look for the closest match.

5. Use the repair tools

If the earlier steps fail, use the system file tools. Back up important files first.

Search for Command Prompt, right-click it, and choose Run as administrator.
Run sfc /scannow and wait for it to finish.
Run DISM /Online /Cleanup-Image /RestoreHealth and wait for it to finish.
Restart and check for updates again.

These tools can take a while, and the progress may look stuck. Let them run.

If it still fails

Write down the error code shown on screen or in Windows Update history, and search for it with your Windows version.
Try Microsoft's own installation or update assistant, downloaded from Microsoft's official site, for feature updates.
Download the specific update manually from Microsoft's update catalogue if one update repeatedly fails.
Pause updates for a short time if you need the computer for work, and come back to it.
Ask for help from your IT team if the computer is managed by an employer.

Why updates fail

Low disk space.
A device or driver conflict.
A damaged or incomplete update download.
Security software or a VPN interfering.
An interrupted earlier update.
A very old or unsupported system that cannot take the new version.

Common mistakes

Holding the power button early. It can turn a delay into a repair job.
Starting an update at a bad moment, such as before a meeting or with a low battery.
Ignoring updates for months, so a huge pile of changes arrives at once.
Using unofficial "fix" tools or downloads from unknown sites.
Skipping a backup.

Make updates routine

Updates are easier when they are small and regular.

Install updates when they appear, while you are not busy.
Keep at least some free disk space.
Keep important files backed up, so an update is never a risk to your work.
Restart at least weekly so pending changes finish.
Do not delay security updates for long.

What you are seeing, and what it means

What you see	What is probably happening	What to do
A percentage that does not move for a long time	The computer is working on a heavy stage	Wait, keep it plugged in
"Undoing changes" or "Reverting"	The update failed and is rolling back	Let it finish, then free space and retry
An error code and "Try again"	A specific failure, often disk, driver, or file damage	Note the code, run the troubleshooter
Reboot loop	The update cannot finish a step	Let it try a few times, then use recovery options or ask for help
Windows Update button greyed out	A policy or pending restart	Restart; if the computer is managed, ask IT

How to protect yourself before a big update

Back up your files to an external drive or a separate cloud service, not only a sync folder.
Plug in the power.
Close programs and save work.
Check free space in Storage settings.
Pick a quiet time. A major update can take a while, and you do not want to be waiting for it before a deadline.

Quick checklist

Wait. Keep it plugged in. Do not force a shutdown early.
Restart if there is truly no activity for hours.
Free disk space and unplug extra devices.
Run the Windows Update troubleshooter.
If needed, run SFC and DISM, after backing up your files.

Save this cheat sheet

Cheat sheet: fixing a stuck or failed Windows update

Screenshot this or save the image. It is the short version of the guide, and it is easier to find in a hurry than a web page.