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

Here are multiple methods to fix error code 0x80070003 in Windows 8.1:

1. Use the Windows Update Troubleshooter: Navigate to Control Panel > Troubleshooting > System and Security > Windows Update > Run the troubleshooter.
2. Clear the Software Distribution Folder: Go to C:\Windows\SoftwareDistribution and remove all files and folders. Restart your computer and try the updates again.
3. Temporarily disable your antivirus software: Antivirus programs can sometimes block updates. Turn off your antivirus software and attempt the updates once more.
4. Scan your hard drive for errors: Open This PC > Right-click the desired drive > Properties > Tools > Check. This will identify and fix any hard drive errors.
5. Reset Windows Update Components: Open Command Prompt as an administrator and execute the following commands one at a time:

 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. Use System Restore: If all else fails, try restoring your system to a previous point when everything was functioning correctly.

Note: Ensure you back up your essential files and data before attempting any of these solutions.