A Windows update is supposed to be a routine process, but things can get frustrating when your PC restarts unexpectedly during an update. Sometimes Windows restarts once and finishes normally. In other cases, the computer may restart repeatedly, get stuck on the update screen, show an error, or return to Windows without installing the update.
The good news is that an unexpected restart does not always mean your computer has a serious problem. It can happen because of automatic restart settings, corrupted update files, insufficient storage, driver conflicts, damaged system files, or problems with Windows Update components.
If your computer keeps restarting during updates, work through the steps below in order.
Windows restarts unexpectedly during an update
To stop Windows from unexpectedly restarting during an update, first make sure your PC has enough free storage and is connected to reliable power, then pause and resume Windows Update, restart the Windows Update services, run the Windows Update troubleshooter, clear corrupted update files, repair system files with DISM and SFC, and install the update again. If the restart happens before Windows loads normally, use Windows Recovery Environment to access Startup Repair or Safe Mode.
An important point is that you should not immediately force your computer to shut down if Windows is actively installing an update. Interrupting an update at the wrong moment can potentially cause additional problems.
If Windows has been sitting on exactly the same screen for an unusually long period and appears completely unresponsive, recovery options may be necessary.
Step 1: Check Whether Windows Is Actually Installing an Update
Before changing anything, determine whether the restart is part of the normal update process.
Open Settings by pressing Windows + I. Go to Windows Update > Update history. Look at the most recent updates and check whether an update shows as successfully installed, failed, or requiring another restart.
If Windows restarted and then continued the installation, the restart may have been normal. Windows sometimes needs to reboot more than once while replacing system components.
However, if the same update repeatedly appears under Failed updates, or your PC keeps restarting without completing the installation, you have a genuine update problem that needs troubleshooting.
Step 2: Make Sure Your PC Has Enough Storage
Windows needs free disk space to download, unpack, and install updates. If your system drive is nearly full, the update may fail or behave unpredictably.
Go to Settings > System > Storage. Give Windows a moment to calculate your storage usage. Look at the amount of available space on the drive where Windows is installed, usually the C: drive.
If storage is low, open Temporary files and review what Windows can safely remove. You can also uninstall applications you no longer use by going to Settings > Apps > Installed apps.
After freeing up space, restart your computer normally. Then go to Settings > Windows Update and select Check for updates.
Step 3: Connect Your PC to Reliable Power
An unexpected restart can sometimes be caused by power interruptions rather than Windows Update itself.
If you’re using a laptop, connect the charger before starting the update. If you’re using a desktop computer, make sure the power cable is firmly connected and that the computer is not connected through a problematic extension or power strip.
Go to Settings > Windows Update > Advanced options and review the available update settings. Avoid beginning a major update when your laptop battery is critically low.
A stable power connection is especially important because Windows may restart several times while completing an update.
Step 4: Pause and Resume Windows Update
If Windows Update appears stuck or keeps attempting the same installation, temporarily pausing the update can refresh the update process.
Go to Settings > Windows Update > Pause updates. Select the available pause option and allow Windows Update to pause.
Restart your computer normally. Then return to Settings > Windows Update and select Resume updates.
After that, select Check for updates and allow Windows to download the update again. This simple refresh can resolve temporary update-state problems without requiring advanced troubleshooting.
Step 5: Run the Windows Update Troubleshooter
Windows includes a built-in troubleshooter designed to identify common update problems.
Go to Settings > System > Troubleshoot > Other troubleshooters. Find Windows Update and select Run.
Follow the instructions displayed on screen. Windows may check update services, configuration settings, and other components that are required for updates to work correctly.
When the troubleshooter finishes, restart the computer. Then go to Settings > Windows Update and select Check for updates.
If the troubleshooter reports that it made a change, test Windows Update again before moving to the next step.
Step 6: Restart the Windows Update Services
Windows Update depends on several background services. If one of these services becomes stuck, an update may repeatedly fail and trigger another restart attempt.
Press Windows + R, type services.msc, and press Enter. In the Services window, locate Windows Update.
Right-click Windows Update > Restart. If Restart is unavailable, choose Start instead.
Next, locate Background Intelligent Transfer Service, commonly called BITS. Right-click BITS > Restart.
Also check Cryptographic Services. Right-click it and select Restart.
Once these services have been restarted, close the Services window. Go to Settings > Windows Update and select Check for updates.
Step 7: Clear the Windows Update Cache
A corrupted update download can cause Windows to repeatedly download or install the same problematic files. Clearing the Windows Update cache forces Windows to create a fresh download.
First, press Windows + R, type services.msc, and press Enter.
Find Windows Update, right-click it, and choose Stop. Do the same for BITS.
Now open File Explorer and go to C:\Windows\SoftwareDistribution. Select the contents inside this folder and delete them. You are clearing the downloaded update cache, not removing Windows itself.
Return to Services and restart Windows Update and BITS.
Finally, go to Settings > Windows Update > Check for updates. Windows will download fresh update files.
Step 8: Repair Windows System Files
If important Windows system files are damaged, updates may fail even when Windows Update itself is functioning correctly.
Right-click the Start button and select Terminal (Admin) or Windows PowerShell (Admin), depending on your Windows configuration.
First, run the Deployment Image Servicing and Management command by entering:
DISM /Online /Cleanup-Image /RestoreHealth
Press Enter and let the process finish. It can take some time, so don’t close the window just because progress appears slow.
After DISM completes, run:
sfc /scannow
Make sure there is no extra space at the beginning when entering the command.
Allow System File Checker to reach 100 percent. When both scans are complete, restart your computer and try Windows Update again.
Step 9: Check Your Drivers and Recently Installed Software
A driver or recently installed application can sometimes interfere with an update, particularly when the computer restarts and loads updated system components.
Go to Settings > Windows Update > Advanced options > Optional updates. If driver updates are available, review them before installing anything.
You can also check Settings > Apps > Installed apps and look for software you installed shortly before the restart problem began.
If the problem started immediately after a particular driver update, opening Device Manager can help you investigate it. Go to Start > Device Manager, expand the relevant hardware category, right-click the device, and select Properties > Driver.
Avoid uninstalling drivers randomly. If you are unsure which driver is involved, leave it unchanged and continue with the safer Windows Update troubleshooting steps.
Step 10: Use Windows Recovery Options If Windows Keeps Restarting
If your computer repeatedly restarts before you can reach the Windows desktop, use the built-in recovery environment.
Allow Windows to enter the Windows Recovery Environment after several failed starts, or access it through Settings > System > Recovery > Advanced startup > Restart now when you can still access Windows.
Select Troubleshoot > Advanced options. From here, you can use options such as Startup Repair, Uninstall Updates, or Startup Settings.
If the issue began immediately after a particular update, Uninstall Updates may be especially useful. Choose the appropriate update removal option and follow the instructions.
If Windows starts afterward, return to Settings > Windows Update and check for updates again.
Step 11: Prevent Windows From Restarting at an Inconvenient Time
Once Windows Update is working again, configure your active hours so Windows is less likely to restart while you’re using the computer.
Go to Settings > Windows Update > Advanced options > Active hours. Choose Automatically or manually set the hours when you normally use your PC.
You can also go to Settings > Windows Update > Advanced options and review the restart-related settings available on your version of Windows.
This does not repair a corrupted update, but it can prevent unexpected update-related restarts from interrupting your work.
Faqs
Why does my computer keep restarting during Windows Update?
Repeated restarts can be caused by failed update files, corrupted system components, driver conflicts, insufficient storage, or Windows Update service problems. Check Update history first to see whether the same update is failing repeatedly.
Is it safe to turn off my computer during a Windows update?
You should generally avoid manually shutting down the PC while Windows is actively installing an update. If the computer is genuinely frozen for an extended period, use Windows Recovery Environment rather than repeatedly forcing power-offs.
Why does Windows restart but not complete the update?
This can happen when an update cannot apply a required system change. Corrupted update files, damaged Windows components, incompatible drivers, and insufficient storage are common areas to investigate.
Will clearing the Windows Update cache delete my personal files?
No. Clearing the SoftwareDistribution contents removes cached update files. It does not normally delete your documents, photos, applications, or other personal files.
Should I use DISM or SFC first?
For update-related system corruption, running DISM first and SFC afterward is a sensible approach. DISM can repair the Windows component store that SFC relies on when repairing protected system files.
What if Windows keeps restarting before I can log in?
Enter Windows Recovery Environment and use Troubleshoot > Advanced options. Depending on what caused the problem, Startup Repair, Uninstall Updates, or Startup Settings can help you regain access to Windows.
Summary
When Windows restarts unexpectedly during an update, don’t assume that you need to reset or reinstall Windows immediately. Start with the basics by checking Update history, available storage, and power stability. Then work through the Windows Update troubleshooter, restart the necessary services, clear the update cache, and repair system files with DISM and SFC.
If the computer continues restarting before Windows loads, move to the Windows Recovery Environment and consider Startup Repair or Uninstall Updates.
Taking these steps in order gives you a practical way to identify whether the problem is caused by the update itself, corrupted Windows components, drivers, or the update service.