I receive an "element not found" message with #0x80070490 when I try to install Windows 7 SP1

Hi,

Thank you for the update.

What is the make and model of computer?

Cause of the issue:

Component-Based Servicing (CBS) manifest is corrupted. (CBS Manifest) that's needed to install updates is corrupt. To correct this problem, you'll need to repair Windows. Repairing Windows won't damage your personal files or the programs that are installed on your computer. For more on “CBS” Component, refer the article: http://technet.microsoft.com/en-us/library/cc756291(v=WS.10).aspx

Try the methods mentioned that you have not tried in the articles below and check:

Step 1: Perform System File Checker (SFC) scan, to repair the missing/corrupted system files:

http://support.microsoft.com/kb/929833

Step 2:

You receive a "0x80070490" error code when you use Windows Update or Microsoft Update Web sites to install updates:http://support.microsoft.com/kb/958044

Warning: Before you perform an in-place upgrade, you should be prepared for a worst case scenario that results in your existing data on your computer being deleted. This data includes personal data, settings, hardware driver information, and software programs. If a worst case scenario occurs, you may have to reinstall all programs. Make sure that you back up personal data to disks or to other external storage devices before you perform an in-place upgrade.

How to back up or transfer your data on a Windows-based computer:**http://support.microsoft.com/kb/971759******

For more, refer the article below:

The error 0X80070490(Element not found) when you are installing a service pack or update

Additional Reference links:

Steps to follow before you install Windows 7 SP1 and Windows Server 2008 R2 SP1 from the Microsoft Download Center:**http://support.microsoft.com/kb/2505743******

Disclaimer: Any data files that are infected may only be cleaned by deleting the file entirely, which means there is a potential for data loss.

Learn how to install Windows 7 Service Pack 1 (SP1):**http://windows.microsoft.com/installwindows7sp1******

Hope it helps.