Be attentive and learn how to fix the error code 0x800f0991 while installing the KB5036893 update, as here, we have it all covered.
In turn, error number 0x800f0991 reflects the Windows update installation error KB5036893. Basically, the emergence of an error message is a sure indication of some sort of problem with the Windows update process, which in turn usually happens because of some damaged system files or files of the Windows update lying in the SoftwareDistribution folder. The two critical Windows services, namely Windows Update and Background Intelligent Transfer Service, may stop executing in the background and cause the problem.
This is usually brought about by file corruption in the SoftwareDistribution folder. Windows Update creates files temporarily in this SoftwareDistribution folder. At times, when this folder becomes corrupted, Windows tends to have installation problems and gives out error codes like 0x800f0991.
Now that we have identified the root causes, let's talk about the potential solutions.
1. Reset the Windows Update Component
As also mentioned above, an issue with Windows Update services or with files downloaded via the Windows Update program may be the reason. The reset of the Windows Update component is a procedure that does both-restarts the stopped Windows Update services and clears the SoftwareDistribution folder that may include corrupted files causing this issue.
The batch file, "Windows Update Reset," can be downloaded from this link.
Launch it from the downloads folder, right-click on it, and from the context menu select Run as administrator.
Please be patient while Command Prompt executes the commands.
You will have successfully reset your Windows Update components when the operation finishes.
2. Run an In-Place Upgrade
An in-place upgrade is quite simple: one just needs to download and mount a Windows ISO file. This will update Windows to the most recent version, replacing broken components. If after that the problem still exists, then you definitely have to do an in-place upgrade.
Download Windows 11 using Microsoft's official website.
Run the downloaded ISO by executing it. You can also right-click any file and choose Mount from the context menu.
After mounting the ISO, launch setup.exe inside it and follow the wizard until Windows restarts.
You shouldn't see the error any more after the process finishes.
3. Manually Download Windows Update
For whatever reason an update for Windows fails to install, perhaps due to the problems in the Windows Update component, we may try downloading it ourselves too.
Download it manually-this is one straightforward approach to resolving a Windows update issue.
To install the update, go to the Microsoft Update Catalog and search using KB5036893.
Find the update that you want and click the Download button that will appear next to it. A new window will pop up; to start downloading, double-click on the link there.
Locate the file where the update has been saved and then double-click on it to start installing it.
4. Run SFC and DISM Commands
One of the ways to resolve problem 0x800f0991 is through fixing corrupted files by running System File Checker and DISM commands. System File Checker is a command-line utility that fixes damaged DLL and executable files in the system. On the other hand, the DISM command fixes more system-level problems, including those related to Windows Update.
Open the Command Prompt by using the Windows key.
Right-click the Command Prompt and select Run as administrator.
Following that, copy each of the following commands in turn into the Command Prompt window:*/ run scannow RESTOREHEALTH DISM /Online /Cleanup-Image
Check to see if the issue has been resolved after all the commands have completed running.
Other problems of Windows updates are due to low system drive space. You need to run a disk clean up by deleting damaged temporary and cache files in order to make room for the Windows upgrades. This will take you, in case the space is short, running through the disk cleanup application by following instructions provided in the linked article itself.
That's all about How to Fix 0x800f0991 Error Code When Installing KB5036893 Update. We hope we were able to help you a lot.
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