Fixing Windows 8.1 Installation Error 0x80070490

Explore multiple strategies to rectify the installation error code 0x80070490 on Windows 8.1:

1. Utilise the Windows Update Troubleshooter: Navigate to Control Panel > Troubleshooting > System and Security > Windows Update and activate the troubleshooter.
2. Refresh Windows Update components: Launch Command Prompt with administrator rights and execute these commands sequentially:

 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. Inspect for damaged system files: Open Command Prompt as an administrator and input:

 sfc /scannow 

4. Deactivate antivirus software: Antivirus programs can sometimes obstruct the installation process. Temporarily disable your antivirus and attempt the updates once more.
5. Execute a clean boot: Performing a clean boot may help identify and resolve conflicts causing the error. Follow these instructions:

a. Press the Windows key + R to bring up the Run dialog box.
b. Enter msconfig and hit Enter.
c. In the System Configuration window, select the Services tab.
d. Tick the box to Hide all Microsoft services.
e. Select Disable all.
f. Go to the Startup tab.
g. Open Task Manager.
h. Disable all startup items listed.
i. Close Task Manager and click OK in the System Configuration window.
j. Reboot your PC and attempt the update installation again.


If the above methods fail, consider a system restore or a reinstallation of Windows.