The Windows Update error code 800B100 usually occurs to Windows 7. If you can’t install Windows Update due to this error code, don’t worry. To fix the problem, you can try the methods below.
Try these methods
Method 1: Reset Windows Update components
To fix the Windows Update error code 800B0100, you can try resetting Windows Update components. Then you need to rename the SoftwareDistribution folder and the catroot2 folder, which store files and signatures related with Windows Update.
Here’s how to rename these two folders.
1) On your keyboard, press Win+R (the Windows logo key and the R key) at the same time to invoke the Run box.
2) Type “cmd” into the Run box and press Shift+Ctrl+Enter to open Command Prompt as Administrator.
3) At the Command Prompt, type the following commands to stop the services accessing the SoftwareDistribution folder and the catroot2 folder (you can just copy and paste the commands). Make sure you press Enter after each command.
net stop bits net stop wuauserv net stop cryptsvc
4) Go to the folder location and rename the folders.
4a) Open File Explorer, and then go to C:\Windows and locate the SoftwareDistribution folder. Rename the folder to “SoftwareDistribution.old“.
4b) Go to C:\Windows\System32 and locate the catroot2 folder. Rename the folder to “catroot2.old“.
Tip: If you can’t rename the catroot2 folder via File Explorer, you can do it using commands: type the following command at the Administrator Command Prompt and press Enter.
ren C:\Windows\System32\catroot2 catroot2.old
5) At the Command Prompt, copy and paste the following commands to restart the services which were stopped in Step 3). Make sure you press Enter after each command.
net start bits net sart wuauserv net start cryptsvc
6) Exit the Command Prompt.
Restart your computer and check to see if the Windows Update error code 800B0100 is resolved.
If Method 1 doesn’t work for you, you can continue to try Method 2.
Method 2: Run Windows Update troubleshooter
Windows 7 has a built-in Windows Update troubleshooter that can troubleshoot and fix Windows Update errors. You can run it and see if it helps fix the error code 800B0100.
Here’s how to run Windows Update troubleshooter:
1) Click the Start menu, type “troubleshoot“, and then select Troubleshooting from the search results.
2) Click Fix problems with Windows Update.
4) Click Next. Then Windows will start troubleshooting any issues related with Windows Update. Just wait for the process to be complete.
If you see any errors or problems, follow the on-screen instructions of the troubleshooter to fix them.
If Method 2 doesn’t work for you, continue to try Method 3.
Method 3: Run the System Update Readiness Tool
To fix the Windows Update error code 800B0100, you can try to run the System Update Readiness tool, a tool developed by Microsoft that is used to repair Windows Update errors.
1) Go to Microsoft Update Catalog.
2) Locate the download file of the tool corresponding to the version of Windows that is running on your computer, and then click the Download button.
3) At the download page, click the download link that has the file name ended with .msu (shown as below screenshot).
4) Double-click on the downloaded .msu file and follow the on-screen instructions to install the tool.
When the tool is being installed, it automatically runs. The process typically takes less than 15 minutes, but it may take longer depending on your computer. Wait until the process is complete.
5) When you see installation complete, select Close.
6) Restart your computer.
7) Try installing the Windows Update again.
If Method 3 doesn’t work for you, continue to try Method 4.
Method 4: Install the update package manually
If none of the above methods fixes the problem, you can try to download the update package from Windows Update Catalog directly, and then install the update package manually. Here’s how:
1) Go to Windows Update Catalog.
2) Type the name of the update package into the search box and then click Search.
3) Download the package based on your Windows 7 version (64bit or 32bit).
4) Double-click on the downloaded file (MSU file) and follow the on-screen instructions to install the package.
5) Restart your computer for the changes to take effect.
Hopefully you can fix the Windows Update error code 800B0100 with the above methods. If you have any questions, feel free to drop a comment below. I’ll get back to you ASAP.