Error 80070020 and 80070490 Windows upgrade codes

I tried to update windows and cannot install updates I got these error code 80070020 and 80070490 how can I fix this problem and get the updates to install?

CATFISH

You receive error 0 x 80070020 when you use the Windows Update Web site or the Microsoft Update Web site to install the updates
http://support.Microsoft.com/kb/883825

and

0 X 80070490 - ERROR_NOT_FOUND
Corrupted system file; You will need to perform an upgrade on the spot or reinstalling the operating system.

The error you receive occurs if there is corruption in the manifest of component maintenance base.

Ignore the title: the "Windows features" dialog box is empty in Windows 7 or Windows Vista, or you receive an error message that includes the following code when you try to use Windows Update: "0 x 80073712".
http://support.Microsoft.com/kb/931712
"Explains the SFC / Scannow.

See also: how to use the System File Checker tool to fix the system files missing or corrupted on Windows Vista or Windows 7
http://support.Microsoft.com/kb/929833

A repair install is the usual solution of SFC/scannow does not work.
However, a repair (AKA In-Place Upgrade) installation will be not solve the problem if it is due to a hijackware infection.

You receive an error code "0 x 80070490" when you use Microsoft Update or Windows Update Web sites to install updates
http://support.Microsoft.com/kb/958044

NB: If you have installed SP1 or SP2 for Vista

Step 7 (method for Windows Vista), the * UPGRADE option is not available because Service Pack/s are installed and that your operating system is newer than the system you are trying to reinstall, so service pack/s must be removed in this case.

Uninstall the Service Pack/s: How to uninstall Windows Vista service packs as a troubleshooting step
http://support.Microsoft.com/kb/948537

See also:

How to overcome error 0 x 80070490 when installing updates in Windows Vista/Server 2008
http://blogs.msdn.com/andrekl/archive/2008/09/29/how-to-overcome-error-0x80070490-when-installing-updates-in-Windows-Vista-Server-2008.aspx

Tags: Windows

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