Windows Update error 0x800F0922: Cannot reach the update servers, or System Reserved partition is full
Updated
Cleared for publishing after the automated checks on .
What the code means
The PC might not have been able to connect to the Windows Update servers, or the System Reserved partition might not have enough free space. (Get help with Windows upgrade and installation errors)
Windows Server 2016 only: The July cumulative update failed to be installed on Windows Server 2016 (Windows Update common errors and mitigation)
Code facts for 0x800F0922
| Code as Windows shows it | 0x800F0922 |
|---|---|
| Type | HRESULT (Windows result code) |
| Symbolic name | CBS_E_INSTALLERS_FAILED |
| Hexadecimal, 8 digits | 0x800F0922 |
| Decimal (unsigned) | 2148469026 |
| Decimal (signed 32-bit) | -2146498270 |
| Severity | failure |
| Group | Windows Update errors |
Read with care
- MS-ERREF names facility 15 FACILITY_SETUPAPI, but Microsoft's Windows Update pages list 0x800F0xxx codes such as 0x800F081F under servicing (CBS) names, so no facility label is shown. ([MS-ERREF]: HRESULT, Fix Windows Update corruptions and installation failures)
Code facts: Get help with Windows upgrade and installation errors (Microsoft Support), checked Nov 14, 2026. Summary in our own words; Microsoft's page has the full steps.
Code facts: Windows Update common errors and mitigation (Microsoft Learn, CC BY 4.0), checked Nov 14, 2026.
Where this error shows up
This code shows up while Windows Update or a Windows upgrade is downloading, installing or setting up.
Applies to
Windows 11 and Windows 10 (as listed at the top of the Microsoft page). The page notes Windows 10 support ended 14 Oct 2025.
Try these first
These steps carry no risk flag in the data. They keep the order of the full list below, which is not reordered. A step without a flag is not a promise that it is safe for your computer.
7 steps to try, in order
Steps are grouped by the Microsoft page they come from. The page lists only what those pages give; other causes of 0x800F0922 are not covered. 4 steps are flagged.
If this page and Microsoft's page differ, follow Microsoft's page.
Microsoft also gives general steps that cover this code: see the general steps in the Windows Update errors group. Each block there says which codes its Microsoft page gives the steps for.
From: Get help with Windows upgrade and installation errors
Source: Get help with Windows upgrade and installation errors (Microsoft Support), checked Nov 14, 2026. Summary in our own words; Microsoft's page has the full steps.
Disconnect the VPN
If you connect to a work network over a VPN, disconnect, turn the VPN software off and try the upgrade again.
System Reserved partition too full
Changes disksMicrosoft says the error can also mean the System Reserved partition is out of space, and that third-party software that makes that partition bigger might fix it.
Microsoft advises: Back up your personal files before you try these fixes. (Back up and restore with Windows Backup)
From: Troubleshoot problems updating Windows
Source: Troubleshoot problems updating Windows (Microsoft Support), checked Nov 14, 2026. Summary in our own words; Microsoft's page has the full steps.
Microsoft's page asks you to back up your personal files before trying its fixes.
Turn off the VPN
If you use a VPN, switch it off and try again.
From: Windows Update common errors and mitigation
Source: Windows Update common errors and mitigation (Microsoft Learn), checked Nov 14, 2026. © Microsoft, licensed under CC BY 4.0. Steps shortened and reworded by PC Driver Update.
Microsoft's common Windows Update errors table gives this cause for a July cumulative update on Windows Server 2016 only.
Windows Server 2016: give the spp folder write permissions
Applies to Windows Server.
Changes permissions on system foldersIn the CBS.log you might find that updates roll back when License and Product key tokens fail to be updated. This can be resolved by adding write permissions for the "User" and "Network Service" accounts to the C:\Windows\System32\spp\ folder.
Microsoft advises: Back up your personal files before you try these fixes. (Back up and restore with Windows Backup)
From: Error 0x800F0922 caused by corrupted scheduled task when installing Windows updates
Source: Error 0x800F0922 caused by corrupted scheduled task when installing Windows updates (Microsoft Learn), checked Nov 14, 2026. © Microsoft, licensed under CC BY 4.0. Steps shortened and reworded by PC Driver Update.
Microsoft's page for 0x800F0922 caused by a corrupted SecureBootEncodeUEFI scheduled task (applies to Windows Server).
Confirm the cause in the logs
Applies to Windows Server.
The CBS.log shows the Task Scheduler installer failing with HRESULT 0x80070002 and a rollback with 0x800f0922, and the Task Scheduler log shows Event ID 146 for task "\Microsoft\Windows\PI\SecureBootEncodeUEFI": the scheduled SecureBootEncodeUEFI task is corrupted.
Remove the staged update packages
Applies to Windows Server.
Changes the Windows installationFind the staged packages: Dism /english /online /get-packages /format:table | findstr /i "Staged"
Delete each staged package, for example: Dism /online /remove-package /PackageName:Package_for_RollupFix~31bf3856ad364e35~amd64~~14393XXXX
Microsoft advises: Back up your important files before you start. If BitLocker is on, you'll need your BitLocker recovery key for most recovery options in Windows RE. (Recovery options in Windows)
Delete the corrupted task's registry entries
Applies to Windows Server.
Changes the registryGet the task GUID: reg query "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree\Microsoft\Windows\PI\SecureBootEncodeUEFI" /v ID
Replace {GUID} with that value and run: reg delete "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Maintenance\{GUID}" /f, reg delete "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Plain\{GUID}" /f, reg delete "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tasks\{GUID}" /f and reg delete "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree\Microsoft\Windows\PI\SecureBootEncodeUEFI" /f
Microsoft advises: Back up the registry before you change it, so you can restore it if a problem occurs. (How to back up and restore the registry in Windows)
Stop and get help
If these steps do not fix the problem, or you are not sure about a step, stop and get help from Microsoft Support or from the maker of your PC. Stop at once if the data on this computer is at risk: back up your files first, or ask a professional before you go on.
Dates and review
| Automated checks | first check: ; second check: ; third check: ; fourth check: |
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| Review status | Cleared for publishing after the automated checks on . |