How to Fix Error 0x800F0818 when Installing Service Pack 1 (Windows 7)?

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When installing Service Pack 1 on Windows 7 (or Windows Server 2008), you may encounter issues where the update will fail to install with the message "An unknown error has occurred." In some cases, you may also get an error code of 0x800f0818.

Find and download the System Update Readiness Tool for the version of Windows you are working on. The tool can be found on the Microsoft website with a quick Google search.WH.performance.mark('step1_rendered');

Run the System Update Readiness Tool installer you downloaded. "Installing" the tool will also run it for the first time.

Open Windows Explorer (Start - Computer) and navigate to "%systemroot%\Logs\CBS\" using the address bar.

Open CheckSUR.log using Notepad or a similar text editor.If you see a number of fixed files at the top of the log: try to install Service Pack 1 again.If you see anything under "Unavailable repair files": keep reading.

If there are unavailable repair files you will see two or more packages. As an example: Package_for_KB2506014_RTM~31bf3856ad364e35~amd64~~6.1.1.0.mum and Package_for_KB2506014_RTM~31bf3856ad364e35~amd64~~6.1.1.0.cat.

In the file name should be a number proceeded by "KB" (KB2506014 in this example) which is is the update package that is corrupted. Make a note of the number.

Open a browser window and navigate to support.microsoft.com/kb/(number here) for example support.microsoft.com/kb/2506014.

Find and download the package for your version of Windows on the resulting page. Do not run the installer.

Use an extraction utility like 7-Zip to extract the CAB files from the MSU installer and then again to extract the contents of the CAB files.Alternatively you can use the Expand -f: command line utility.

In the extracted files locate the .mum and .cat files mentioned in the CheckSUR.log.

Copy the .mum and .cat files to "%windir%\Temp\CheckSUR\servicing\Packages"

Run the System Update Readiness Tool installer again and check the CheckSUR.log file from steps 3 and 4 when it is finished. You should see that the files have been repaired.

Install Service Pack 1 normally.
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