Microsoft Windows Error Code 0x800F0922: How to Fix It

Medium 30-90 minutes Medium Severity Verified July 2026
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Error Code
0x800F0922
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-90 minutes
Windows error code 0x800F0922 means a Windows Update failed to install because the hidden System Reserved partition on your hard drive does not have enough free space to complete the process. This small partition (typically 100–500 MB) stores critical boot files and temporary update staging data, and when it fills up, updates cannot proceed. The good news is that this is a software-level problem you can fix yourself by freeing up space on that partition or expanding it slightly.
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Tools You'll Need

How to Fix Error Code 0x800F0922

  1. Run the Windows Update Troubleshooter

  2. Check the Size of Your System Reserved Partition

  3. Delete Unnecessary Boot Entries with BCDEdit

    Do NOT delete the current Windows Boot Manager or active OS entry. Deleting the wrong entry can prevent your PC from booting. If you are unsure, skip this step.

  4. Temporarily Assign a Drive Letter to System Reserved and Clean It

    Back up your system or create a restore point before modifying any files on this partition. Deleting the wrong file will cause your PC to fail to boot. If you are not confident, skip to Step 6 instead.

  5. Use Disk Cleanup to Free Space on the Main C: Drive

  6. Expand the System Reserved Partition Using Disk Management or a Third-Party Tool

    Back up all important data before resizing partitions. Power loss during a partition resize operation can cause data loss or an unbootable system. Plug in your laptop charger if applicable.

  7. Re-run Windows Update

  8. Use the DISM and SFC Tools to Repair Windows Component Store

    This process can take 30–60 minutes and will use your internet connection. Do not close the Command Prompt window or shut down the PC while commands are running.

  9. Manually Download and Install the Failed Update

  10. Reset Windows Update Components If All Else Fails

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When to Call a Professional

Contact a professional PC technician or Microsoft Support if: your PC fails to boot after attempting partition changes; the DISM RestoreHealth command fails with errors and cannot connect to Windows Update servers even with a working internet connection; you have an enterprise-managed device where partition changes require IT department approval; or you are uncomfortable working with Command Prompt and partition management tools. Microsoft Support can be reached at support.microsoft.com and offers free chat and phone support for Windows activation and update issues.

Frequently Asked Questions

What is the System Reserved partition and why is it full?
The System Reserved partition is a small, hidden partition created by Windows during installation. It stores the Boot Configuration Data (BCD) store, the Windows Boot Manager, and BitLocker startup files if enabled. It was originally created at 100 MB on Windows 7 systems, 350 MB on Windows 8/10, and 500 MB on some Windows 11 installations. It can fill up over time due to accumulated boot entries from old Windows installations, failed update remnants, or because it was simply created too small to accommodate modern update requirements.
Will error 0x800F0922 cause my computer to stop working?
No, this error does not affect your ability to use your computer day-to-day. It only means a specific Windows Update failed to install. Your existing Windows installation continues to run normally. However, leaving updates uninstalled for a long time can leave your PC missing important security patches, so it is worth resolving the error when you have time.
Is it safe to assign a drive letter to the System Reserved partition?
Yes, temporarily assigning a drive letter is safe as long as you do not delete or modify any critical files inside the partition. The only reason to do this is to view its contents and remove obvious junk. Always remove the drive letter again afterward, because leaving it permanently accessible increases the risk of accidental modification. The partition will continue to function normally with or without a drive letter assigned.
Can I just ignore error 0x800F0922 and skip the update?
You can hide or skip individual updates, but this is not recommended for security or cumulative updates. To hide a specific update temporarily, use the 'Show or hide updates' troubleshooter available from Microsoft's support site (search for 'wushowhide.diagcab'). This stops Windows from offering that update until you un-hide it. However, many updates are cumulative, meaning future updates may also fail if a previous one was never installed. It is best to resolve the root cause rather than continually hiding updates.
Does error 0x800F0922 affect Windows 10 and Windows 11?
Yes, error 0x800F0922 can appear on both Windows 10 and Windows 11. It is particularly common on PCs that were originally installed with Windows 7 or Windows 8 and upgraded over the years, because the System Reserved partition was created at the smaller legacy size. PCs with a clean Windows 10 or 11 installation typically have a larger System Reserved partition and are less likely to encounter this error, though it can still occur if the partition fills up with old boot entries.

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