Solving Windows 8.1 Installation Errors: Comprehensive Guide

There are various methods to fix the error code 0x80070490 in Windows 8.1:

1. Use the Windows Update Troubleshooter: Navigate to Control Panel > Troubleshooting > System and Security > Windows Update > Run the troubleshooter.
2. Reset Windows Update components: Open Command Prompt with admin rights and input these 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 

3. Scan for corrupted system files: Open Command Prompt with admin rights and enter this command:

 sfc /scannow 

4. Turn off antivirus software: Antivirus programs can sometimes block the installation process. Temporarily disable your antivirus and attempt the updates again.
5. Perform a clean boot: A clean boot can help pinpoint and resolve software conflicts causing the error. Follow these steps to perform a clean boot:

a. Press Windows key + R to open the Run dialog.
b. Type msconfig and press Enter.
c. In the System Configuration window, click on the Services tab.
d. Check the box next to Hide all Microsoft services.
e. Click on Disable all.
f. Click on the Startup tab.
g. Click on Open Task Manager.
h. Disable all startup items.
i. Close Task Manager and click OK in the System Configuration window.
j. Restart your computer and try to install the updates again.


If these solutions do not resolve the issue, consider performing a system restore or reinstalling Windows.