To understand the Windows Update Erorr 80070490, you can also go through the following link before trying these troubleshooting steps.
Windows Update Error 80070490
When you try to install the latest updates from Windows Updates or Microsoft Updates, you may receive the following error message
This issue may occur if the Windows security .dll files are registered incorrectly.
Use the System Update Readiness Tool to resolve this issue. This tool will scan you computer for inconsistencies that may cause errors to occur. To run the System Update Readiness Tool, follow these steps:
Swipe in from the right edge of the screen, and then tap Search. (If you’re using a mouse, point to the upper-right corner of the screen, move the mouse pointer down, and then click Search.)
Type command prompt in the search box.
In the list of results, swipe down on or right-click Command Prompt, and then tap or click Run as administrator.
In the Administrator: Command Prompt window, type the following commands exactly as they appear. Press theEnter key after each command:DISM.exe /Online /Cleanup-image /Scanhealth
DISM.exe /Online /Cleanup-image /Restorehealth
To close the Administrator: Command prompt window, type Exit, and then press Enter.
Run Windows Update again.
To resolve this issue, use the System Update Readiness Tool. This tool will scan your computer for inconsistencies that may be responsible for the errors. To run the System Update Readiness Tool, follow these steps:
In the table below, click the download link that matches your version of Windows. If you’re unsure of which version of Windows you are running, follow these steps:Click the Start button, then type msinfo32 in the Search box. Click msinfo32.
Your version of Windows will be listed next to OS Name and your file type (x64 or x86) will be listed next toSystem Type.
Choose the appropriate language in the Change Language list, and then click Download.
When you are prompted to do so, click Run to start the installation.
Follow the onscreen instructions to install the System Update Readiness Tool.
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