Tips to Fix Windows Update Error 0×80070490

When you use Windows Update or Microsoft Update Center to install updates for your system, you may get an error code 0×80070490 which results in update failure. This error is commonly seen when the service packages of windows system are being installed, for example, windows 7 sp1 and windows vista sp1.

The cause of this error is that the system is missing some important components for Windows update. To solve this, you have to repair the system. Instructions are given below:

For Windows XP, Windows Server 2003, and Windows 2000

Use the System File Checker to verify that the correct versions of the system files are present. To do this, follow these steps:

Click Start, and then click Run.
Copy and then paste (or type) the following command in the Open box, and then press ENTER:
cmd
At the command prompt, type sfc /scannow, and then press ENTER. Note If you are prompted for your Windows XP CD, insert the CD into the CD drive.
After the System File Checker has finished, try to install updates again.

For Windows 7, Windows Server 2008 R2, Windows Vista and Windows Server 2008
Performe a repair installation to restore the current Windows installation to the version of the installation DVD.

Close all the running applications .
Insert the Windows Vista, Windows Server 2008, Windows 7 or Windows Server 2008 R2 DVD in the computer’s DVD drive.
In the Setup window, click Install Now.
Click Go online to obtain the latest updates for installation (recommended).
Type the CD key if you are prompted to do this.
Select the operating system in “Install Windows” page you want to Upgrade or Inplace.
Click Yes to accept the Microsoft Software License Terms.
On the Which type of installation do you want? screen, click Upgrade.
When the installation is complete, restart your computer, and then try to install the updates.

If you do not have a install CD or repair CD of your system, you will have to get a system fixer to help you repair your system. It can also help you improve your computer performance. I suggest you use this tool, it also has a windows update function, which will automatically detect and install the windows update for you.