Dear Spencer
This information is for me not usable because :
My version W 8.1 has no use for the solution to update your proposed version. It's already has an newer and update version of Windows Defender update to today. From the Windows version 8 Microsoft Security Essential is replaced met de improved version of Wiindows Defender..
So the problem stays the same. It's probably a glitch between the two programs who for what i know and all the responses I find not easily resolved. The problem with Windows Defender is that this program is automaticity with Microsoft Windows software version 8 and higher on your PC and it appears that you can't get ride of this. It is normally no problem and I did the only thing I can do ,in my settings i closed the settings witch tell you that a problem has occurred with the app Maintenance.
So it seems that Microsoft and the providers of Virus & Security programme's find that this problem and their answer can be resolved by giving a answer that I must install this or that , however everything that was proposed was already done by me.
I remember on my previous PC running with a earlier version of Windows this problem never occurred , the reason was that automatic Microsoft Security Essential was tuned of when a protection software from another company was installed.
So my conclusion is that the best thing to do is ignore the message in the maintenance section from Windows Defender.
I check it regularly al my settings and every change in my system. Update everything what's important and make on regular times a backup from my whole system on a external source .
Greetings
Mireille