Fix Windows 11 Update KB5029351 Not Installing Error 0x80070002, 0x800f0991

##1. The error code 0x80070002/0x800f0991 can occur when you try to install the Windows 11 update KB5029351. There are a few things you can try to fix this error:

1. Run the Windows Update Troubleshooter. This is an automated tool that can help to fix common problems with Windows Updates. To run the troubleshooter, open the Settings app and go to Update & Security > Troubleshoot. Under "Find and fix other problems", click on "Windows Update" and then click on "Run the troubleshooter".

2. Manually download and install the update. You can download the update from the Microsoft Download Center. Once you have downloaded the update, double-click on it to install it.

3. Reset the Windows Update components. This will reset the Windows Update service and its associated components. To reset the Windows Update components, open the Command Prompt as administrator and run the following commands:

```

net stop wuauserv

net stop bits

net stop cryptsvc

del /f /q %windir%\SoftwareDistribution\Download

rmdir /s /q %windir%\SoftwareDistribution\Download

net start wuauserv

net start bits

net start cryptsvc

```

4. Disable your antivirus or firewall. Sometimes, antivirus or firewall software can interfere with Windows Updates. To temporarily disable your antivirus or firewall, open its configuration and disable it. Once you have installed the update, you can re-enable your antivirus or firewall.

If you have tried all of the above and you are still getting the error code 0x80070002/0x800f0991, you may need to contact Microsoft support for further assistance.

Here are some additional things to keep in mind:

* Make sure that you have enough free disk space to install the update.

* Make sure that your computer is connected to the internet.

* Try restarting your computer.

* If you are using a proxy server, make sure that it is configured correctly.

##2. Fixing Windows update errors can be a bit challenging, but there are several steps you can try to resolve the "KB5029351 not installing" error with error codes 0x80070002 or 0x800f0991 in Windows 11. These errors typically indicate issues with Windows Update components or missing/corrupted system files. Here's a step-by-step guide to help you resolve this issue:

1. Run Windows Update Troubleshooter:

   - Press `Windows Key + I` to open the Settings app.

   - Go to "Privacy & Security" > "Windows Update."

   - Click on "Troubleshoot" and follow the on-screen instructions.

2. Reset Windows Update Components:

   - Open Command Prompt as an administrator:

     - Type "cmd" in the Windows search bar.

     - Right-click on "Command Prompt" and select "Run as administrator."

   - Stop Windows Update Services by running these commands one by one:

     ```

     net stop wuauserv

     net stop cryptSvc

     net stop bits

     net stop msiserver

     ```

   - Rename the SoftwareDistribution and Catroot2 folders to avoid any potential corruption:

     ```

     ren C:\Windows\SoftwareDistribution SoftwareDistribution.old

     ren C:\Windows\System32\catroot2 Catroot2.old

     ```

   - Restart the Windows Update services:

     ```

     net start wuauserv

     net start cryptSvc

     net start bits

     net start msiserver

     ```

   - Try running Windows Update again.

3. Use the Windows Update Assistant:

   - Download and run the Windows Update Assistant from the official Microsoft website. It can help you update to the latest version of Windows 11.

4. Use DISM and SFC Scannow:

   - Open Command Prompt as an administrator (as explained in step 2).

   - Run the following command to check and repair system files:

     ```

     DISM /Online /Cleanup-Image /RestoreHealth

     ```

   - After DISM is complete, run the SFC scan:

     ```

     sfc /scannow

     ```

   - Reboot your computer and try updating again.

5. Check Disk Utility:

   - Open Command Prompt as an administrator.

   - Run a disk check by typing the following command:

     ```

     chkdsk /f

     ```

   - Reboot your computer and let it scan and repair any disk errors if necessary.

6. Perform a Repair Install (In-place Upgrade):

   - Download the Windows 11 Media Creation Tool from the Microsoft website.

   - Run the tool and choose the "Upgrade this PC now" option.

   - Follow the on-screen instructions to perform a repair install, which will repair system files and keep your data intact.

7. Check for Third-party Software Conflicts:

   - Sometimes, third-party antivirus or security software can interfere with Windows updates. Try disabling or uninstalling such software temporarily, then attempt the update.

8. Check for Hardware Issues:

   - Ensure that your hardware, particularly your storage drive, is in good health. Faulty hardware can lead to update issues.

If you've tried all these steps and still can't install the update, you may want to consider reaching out to Microsoft Support or seeking assistance from a professional technician, as there may be underlying issues that require advanced troubleshooting.

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