Microsoft Windows Error Code 0x80070026: How to Fix It

Medium 30-90 minutes Medium Severity Verified June 2026
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Error Code
0x80070026
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-90 minutes
Windows error code 0x80070026 means Windows Update encountered an unexpected end-of-file error during an I/O operation — essentially, a file download or write was cut off before it could finish. This typically happens due to a corrupted update cache, damaged system files, unstable internet connection, or a failing storage drive. The good news is that most cases can be resolved with built-in Windows tools and a few straightforward steps without needing professional help.
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Tools You'll Need

How to Fix Error Code 0x80070026

  1. Run the Windows Update Troubleshooter

    Save all open work before running the troubleshooter, as it may restart certain services that could interrupt unsaved tasks.

  2. Clear the Windows Update Cache

    Only delete the CONTENTS of the SoftwareDistribution\Download and catroot2 folders — do not delete the folders themselves. Run these commands only in an elevated Administrator prompt.

  3. Run SFC (System File Checker)

    Do not close the Command Prompt window while SFC is running. Interrupting the scan can cause additional system file issues.

  4. Run DISM to Repair the Windows Image

    DISM /RestoreHealth requires an active internet connection to download replacement files from Windows Update servers. Do not interrupt the process.

  5. Check Your Internet Connection Stability

  6. Check Your Hard Drive for Errors

    Back up your important files before running CHKDSK with the /r flag, as this process repairs bad sectors which in rare cases can result in data rearrangement on a severely damaged drive.

  7. Download the Update Manually from Microsoft Update Catalog

    Ensure you download the correct architecture version (x64 or ARM64) matching your system. Installing the wrong version will fail and may display a separate error.

  8. Reset Windows Update Components Using the Reset Script

    Running batch scripts from unknown sources is dangerous — only use scripts from trusted sources. This script only resets Windows Update-related components and does not affect your personal files.
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When to Call a Professional

You should seek professional help if CHKDSK reports a large number of bad sectors on your hard drive or SSD, which may indicate impending drive failure and requires hardware replacement. Also contact a technician if DISM /RestoreHealth fails with errors that cannot be resolved, if your Windows installation becomes unbootable during this process, or if the error persists after all steps and you suspect a deeper corruption requiring a Windows repair install or clean reinstall. A Microsoft support agent (support.microsoft.com) can also assist if the failing update is a critical security patch that cannot be installed by any other method.

Frequently Asked Questions

What does Windows error code 0x80070026 mean?
Error 0x80070026 means 'ERROR_HANDLE_EOF' — Windows reached the end of a file unexpectedly during an I/O (input/output) operation. In the context of Windows Update, it means a file download or write was cut off prematurely, usually due to a corrupted update cache, unstable internet connection, or damaged system files.
Will error 0x80070026 cause me to lose data?
No, this error by itself does not cause data loss. It simply means a Windows Update operation failed before completing. However, if the underlying cause is a failing hard drive (detected by CHKDSK), you should back up your data immediately before continuing, as a failing drive is a serious risk to your files.
How do I find out which Windows Update is failing with 0x80070026?
Open Settings > Windows Update > Update history. Failed updates are listed with their KB number and error code. You can search that KB number at catalog.update.microsoft.com to download and install it manually, bypassing the automatic update mechanism that is producing the error.
Does clearing the Windows Update cache delete my personal files?
No. The SoftwareDistribution\Download folder only contains temporary update download files — not your personal documents, photos, or applications. Deleting its contents is completely safe and simply forces Windows Update to re-download any pending updates from scratch.
Can a VPN cause Windows error 0x80070026?
Yes. VPNs and proxy servers can interfere with Windows Update downloads by routing traffic through servers that may throttle, block, or interrupt large file transfers. If you have a VPN or proxy active, disable it before running Windows Update. You can re-enable it after updates have successfully installed.

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