Hi Pratheesh,
The error code 0x80070490 is due to Component-Based Servicing (CBS) manifest is corrupted.
If you are facing the error message while performing Windows Update, refer to the steps from the following Microsoft article.
Error code 0x80070490 when you use Windows Update or Microsoft Update to install updates:
http://support.microsoft.com/kb/958044
**Note:**The apps that came with your PC or you installed from Windows Store will be reinstalled, but any apps you installed from other websites and DVDs will be removed. Windows puts a list of the removed apps on your desktop after refreshing your PC.
**Note:**All of your personal files will be deleted and your settings will be reset. Any apps the came with your PC will be reinstalled, but all other apps will be removed.
If you have any further queries, feel free to post. We are here to help you.