A Windows update that will not download, install, or finish restarting usually has a specific cause: a pending reboot, insufficient temporary storage, damaged update components, an update that does not apply to your Windows build, or a connection to an update server that is timing out. Start by recording the exact error and symptom, then work through Microsoft’s troubleshooter, a restart, Disk Cleanup, and—if necessary—a Windows Update component reset. Use the applicability and network checks for “not applicable” and timeout messages instead of repeating generic fixes.
Identify what is actually failing
“Windows won’t update” describes several different failures. The next safe action depends on where the process stops, so write down the exact message, error code, KB number, and percentage before changing anything. A screenshot or copied error text is useful if you later need support.
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| Symptom | What it often indicates | Start here |
|---|---|---|
| The update will not download or remains at “Pending” | Windows is waiting for a restart, temporary files are blocked, or the update service cannot reach its server | Restart, run the troubleshooter, check free space, then investigate network or policy timeouts |
| Installation stops at a percentage and rolls back | A servicing action failed, system files are inconsistent, or the update is not suitable for the installed build | Record the code, restart, run Disk Cleanup, then reset update components if needed |
| You are repeatedly told to restart | A pending servicing operation has not completed | Restart from Windows, allow the process to finish, and retry only after the desktop returns |
| “This update is not applicable to your computer” | The update may be superseded, aimed at another Windows version or architecture, or missing a Servicing Stack Update prerequisite | Check the exact Windows version, architecture, KB, and prerequisites before downloading anything manually |
| A timeout or connection error appears | The device cannot reach Windows Update, WSUS, Configuration Manager, or Intune | Check the network, proxy, VPN, and organizational policy before repairing local files |
Prepare before troubleshooting
- Save open work and disconnect nonessential USB devices. Leave the keyboard, mouse, display, and network connection attached.
- Make sure you can sign in with an administrator account. The troubleshooter can run without elevation in some cases, but resetting services and repairing the component store requires an elevated Command Prompt.
- Back up important documents before any repair install, reset, or reinstall. The early troubleshooting steps are designed to be non-destructive, but a later recovery operation can change applications or settings.
- Note whether the computer is personally managed or controlled by an employer or school. A managed device may be directed to WSUS, Configuration Manager, or Intune, and local changes may be overwritten by policy.
- Record the Windows edition, version, architecture (for example, 64-bit), exact KB number, error code, and the last step that worked. These details determine whether a downloaded package is appropriate.
Run the built-in Windows Update troubleshooter
Windows 11: use Get Help
- Open Start and launch Get Help.
- Search for Windows Update troubleshooter.
- Select Microsoft’s automated Windows Update troubleshooter and follow its prompts. Allow it to inspect update services, configuration, and common blockers.
- Apply a suggested correction, restart if requested, and try Windows Update again from Settings > Windows Update.
Get Help is the current first-line route for Windows 11. If it reports a specific error, keep that code; it determines which branch to follow next.
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Windows 10: use Settings on supported builds
- Open Settings.
- Go to Update & Security > Troubleshoot > Additional troubleshooters.
- Select Windows Update, choose Run the troubleshooter, and apply any recommended fix.
- Restart and check for updates again.
Windows 10’s free Windows Update software updates, technical assistance, and security fixes ended on October 14, 2025. The troubleshooter can still identify local problems, but an up-to-date result is no longer available through the former free-support model.
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Restart, then make one clean retry
Choose Start > Power > Restart, rather than shutting down and immediately powering on. A restart can complete a pending servicing action that is preventing the next update phase. After signing back in, wait for the desktop to finish loading, connect to a reliable network, and select Settings > Windows Update > Check for updates.
If the same code returns, do not repeatedly click retry without recording it. Move to the branch that matches the code: storage cleanup, component reset, applicability, or connectivity.
Clear temporary and system files with Disk Cleanup
Microsoft’s upgrade-error guidance recommends Disk Cleanup before retrying an upgrade. Temporary download or setup files can consume the space needed for unpacking an update even when File Explorer appears to show adequate free capacity.
- Open the Start menu, type Disk Cleanup, and launch the desktop utility.
- Select the Windows system drive, normally C:, when prompted.
- Choose Clean up system files. Select the system drive again if Windows asks.
- Review the categories. Include temporary files and the available system-file categories; do not select personal files you still need.
- Confirm the cleanup, allow it to finish, restart, and retry Windows Update.
Disk Cleanup removes selected temporary or system files; it does not fix a missing prerequisite, an incorrect package, or a blocked organizational connection. Those cases require the matching sections below.
Reset Windows Update components
A component reset rebuilds Windows Update’s local download and catalog locations. It is a Microsoft-supported troubleshooting action, but it must be performed carefully in an elevated Command Prompt. Close Settings and other update tools first.
Open an elevated Command Prompt
- Open Start and type Command Prompt.
- Right-click it and choose Run as administrator.
- Approve the User Account Control prompt.
Stop the related services
Run each command separately and wait for the confirmation before entering the next one:
net stop wuauserv
net stop bits
net stop cryptsvc
net stop msiserverThese commands stop Windows Update, Background Intelligent Transfer Service, Cryptographic Services, and the Windows Installer service. If a service is already stopped, note the message and continue. If Windows says the service cannot be stopped, close any installer or update window and try again from the elevated prompt.
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Rename the update data locations
Renaming preserves the old folders while forcing Windows to create fresh data. Run:
ren %systemroot%SoftwareDistribution SoftwareDistribution.old
ren %systemroot%System32catroot2 catroot2.oldIf Windows reports that a folder is in use, a service did not stop. Return to the service-stop commands, close programs that may be installing software, and repeat. If an “.old” folder already exists, use a different unique suffix such as “.old2” rather than overwriting it.
Start the services again and retry
net start wuauserv
net start bits
net start cryptsvc
net start msiserverClose the Command Prompt, restart Windows, and check for updates. The first scan can take longer because Windows is rebuilding its local update data. Do not delete the renamed folders immediately; keeping them temporarily gives you a recovery reference if another problem appears.
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When Windows says an update is not applicable
“Not applicable” is not the same as a damaged Windows Update cache. Microsoft’s servicing guidance identifies two common explanations: the update has already been superseded, or the device needs a matching Servicing Stack Update before the package can install.
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- Open Settings > System > About on Windows 11, or Settings > System > About on Windows 10, and note the Windows edition, version, and system type.
- Record the complete KB number shown in Windows Update or the error details.
- Check whether the package is for the same Windows release and architecture. A package for another release or processor architecture will not become correct merely because it has a similar KB number.
- Check whether a newer package supersedes the one you attempted. Installing an older superseded package can correctly produce “not applicable.”
- Check for a required Servicing Stack Update and install the package that matches the device before retrying the main update.
Use the Microsoft Update Catalog only when the package matches
When Microsoft’s guidance calls for a manual package, search the Microsoft Update Catalog by the exact KB number and select the entry matching your Windows version and architecture. Downloading several similarly named packages and trying them at random can create additional errors. If the device is managed, ask the administrator whether the organization distributes updates through WSUS, Configuration Manager, or Intune; a manually downloaded package may be blocked or replaced by policy.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Repair the component store for corruption errors
For an error that explicitly points to component-store corruption, Microsoft documents Deployment Image Servicing and Management (DISM) repair. Open Command Prompt with Run as administrator, make sure the computer is connected to the internet, and run:
DISM /Online /Cleanup-Image /RestoreHealthAllow the command to reach 100 percent. Do not close the window because the progress percentage may pause for an extended period. Restart after DISM completes, then run Windows Update once. If DISM reports that it cannot obtain repair files, treat that as a connectivity or source problem rather than repeatedly rerunning the same command.
DISM is aimed at component-store corruption. It will not make an inapplicable update suitable, bypass an organization’s update policy, or repair a network timeout.
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A timeout can mean Windows cannot communicate with the service that supplies or approves the update. Depending on the computer, that service may be Windows Update, WSUS, Configuration Manager, or Intune.
- Test another network connection if available and confirm that ordinary websites load consistently.
- Disconnect a VPN temporarily if your organization’s policy permits it, then retry. If the computer requires the VPN to reach a corporate update server, keep it connected and contact the administrator instead.
- Review proxy settings and remove an obsolete manual proxy only if you are authorized to do so. Corporate proxies are often required for managed devices.
- Check date and time settings; an incorrect clock can prevent secure connections from succeeding.
- Ask an administrator whether maintenance, approval rules, or an update ring is delaying the package. Do not reset a managed computer’s update configuration without authorization.
If the error changes from a timeout to a component-corruption code after connectivity is restored, follow the DISM branch. If it remains a timeout, local cache resets are unlikely to solve the underlying server or policy issue.
Choose the least risky escalation
| Remedy | Best match | Risk and privileges | Managed-device consideration |
|---|---|---|---|
| Get Help or Settings troubleshooter | Unclear or common Windows Update failures | Low risk; usually suitable for a standard user | Policy may limit what it can change |
| Restart and Disk Cleanup | Pending restart, stalled setup, or temporary-file pressure | Low risk; administrator rights are not normally required | Generally safe, but do not remove organization-controlled files |
| Component reset | Repeated download or installation failures after basic steps | Non-destructive but requires an elevated Command Prompt | Ask before changing service data on a managed device |
| DISM component-store repair | Errors that identify component-store corruption | Requires administrator rights and a reliable connection | Repair-source or policy restrictions may require IT support |
| Manual Catalog package | A known KB with verified version, architecture, and prerequisite | Low risk only when the package is an exact match | May conflict with WSUS, Configuration Manager, or Intune approval |
| In-place repair, reset, or reinstall | Supported troubleshooting has failed and Windows remains unusable or unserviceable | Highest impact; back up files and follow Microsoft’s installation guidance | Obtain organizational approval and recovery instructions first |
Escalate with useful evidence
If the troubleshooter, restart, cleanup, component reset, applicability checks, and appropriate DISM repair do not resolve the failure, stop changing settings at random. Preserve the exact KB number, error code, percentage at failure, whether the update rolled back, and any messages produced by the commands. Keep relevant Windows Update and setup logs available for support. Microsoft’s upgrade and installation guidance can then be used to decide whether an in-place repair is appropriate.
Before a reset or reinstall, back up documents, browser data, activation or license information, and any files stored outside your normal backup. Confirm that you have installation media or a recovery method and know which applications will need to be reinstalled. A reset is not the next step for a simple “not applicable” message or an unresolved proxy timeout; those need the applicability or network owner to be corrected first.
Why Windows 10 behaves differently now
Microsoft ended free Windows Update software updates, technical assistance, and security fixes for Windows 10 on October 14, 2025. Therefore, a Windows 10 computer in 2026 may be functioning as designed when it does not receive the updates that were available during its support period. Local failures can still be diagnosed with the steps above, but troubleshooting cannot restore a support channel that has ended. Verify the device’s Windows version and its applicable support status before spending time on repeated update attempts.
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