Thanks, I'll do that!

I downloaded the latest definition file from MS and ran it -- it installed fine and my Defender now shows as up to date. Another person around here reported that after he did this, auto updates...

Both. W10 Settings merely tells me installs have failed, when I do it from Defender I can watch them fail.

Yes, auto and manual (forced) updates of Defender both fail.

Defender won't update its virus definition file. It tries, and the green bar gets almost to the end then stops. After quite a while, the update fails with an error message saying that the update...

Thanks, will try tomorrow. BTW, hate to sound dense, but how do I install the file you suggest downloading?

Many thanks! There are a lot of files and folders in C:\Windows\SoftwareDistribution\Download. Delete all of them?

The latest Win 10 update (from about 8/12) has really hosed me. Every morning the computer tries to install it, fails, and then removes the update. No error codes. This take about six reboots and...