I have used Avira products for several years and never had any problem with them running Windows ...
Until about a month ago, when Windows 10 did some updates and I updated from Avira 2017 to Avira 2018.
On my particular laptop (Lenovo 15"), this caused the following problem:
The Settings app kept opening on top and not allowing you to do anything anywhere else when it was open, except for restarting or shutting off.
You could close the Settings window and it would re-open about 3 seconds later.
You could use Task Manager to close the Settings app and it would re-open about 10 seconds later.
Several trips to the computer store and several factory resets later, I determined that something in the install code for Avira 2018 is messing with my Settings app code in Windows 10. As the repair people put it, "you've got two antivirus software programs fighting it out; who knows what it would mess up."
My suggestion is to abandon Avira unless you know exactly how to disable WD before installing it. Otherwise you may get the same problem I had.
Raphael in Ottawa, Canada.