I've also had trouble installing Windows updates. I tried all of the troubleshooting tips suggested to no avail. It successfully downloads the updates, but when the computer restarts to install it gets 15% of the way before saying "Failure to configure.
Reverting changes." The error code I get for all failed updates is 80071A90.
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You may also refer this link and try the steps. Temporary connection-related errors may occur when you use Windows Update or Microsoft Update http://support.microsoft.com/kb/836941
Disclaimer: If you have to temporarily disable it to install other software, you should re-enable it as soon as you're done. If you're connected to the Internet or a network while your antivirus software is disabled, your computer is vulnerable
Vinod Archak Forum Moderator
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