How to solve the error code 0x80070003: Windows cannot install required files in Windows 8.1

There are several ways to solve the error code 0x80070003 in Windows 8.1:

1. Run the Windows Update Troubleshooter: Go to Control Panel > Troubleshooting > System and Security > Windows Update > Run the troubleshooter.
2. Delete the Software Distribution Folder: Go to C:\Windows\SoftwareDistribution and delete all the files and folders inside it. Then restart your computer and try to install the updates again.
3. Disable your antivirus software: Sometimes, antivirus software can interfere with the installation process. Disable your antivirus software temporarily and try to install the updates again.
4. Check your hard drive for errors: Go to This PC > Right-click on the drive you want to check > Properties > Tools > Check. This will scan your hard drive for errors and fix them if any are found.
5. Reset Windows Update Components: Open Command Prompt as an administrator and type the following commands one by one:

       net stop wuauserv
       net stop cryptSvc
       net stop bits
       net stop msiserver
       ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
       ren C:\Windows\System32\catroot2 catroot2.old
       net start wuauserv
       net start cryptSvc
       net start bits
       net start msiserver
  

6. Perform a System Restore: If none of the above methods work, you can try performing a system restore to a previous point in time when your computer was working fine.

Note: Before trying any of these methods, make sure you have a backup of your important files and data.