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You receive a "0x80070420" error code when you use the Windows Update or Microsoft Update Web sites to install updates
Article ID: 958054 - View products that this article applies to.
When you try to install updates from the Windows Update Web site or the Microsoft Update Web site, you may receive the following error code:
This problem may occur if the Windows Update service has stopped during the installation process.
To resolve this problem, stop and then restart the Windows Update service. To do this, follow these steps as appropriate for your version of Windows.
Windows Vista and Windows Server 2008
Microsoft Windows 2000, Windows XP, and Windows Server 2003