I think Webroot had a glitch.. it marked all my WD executables that way.. I had to decline to remove them and rescan to get it happy again. I also saw on twitter that some users had a lot of win10 executables marked for removal too.
My guess is a bad descriptor set was used by webroot.. make sure they don't remove WD files (or win10 executables).. they'll likely push a new definition set to their cloud to correct their mistake