Aug 28, 2017 - It may be the result of a botched update to the MSE scanning engine. It seems when that update is (re)installed, the very next update will fail. LEECAD, this does happen when a load of MS updates occur. I would uninstall MSE (and then reinstall and update in the normal way). BTW in normal use, MSE should be. This article provides step-by-step solutions to troubleshoot error code 0x80070643 which comes up in Widows Update, Microsoft Security Essentials and MSI.
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