the only thing I can think of is bing wallpaper viewer. I uninstalled it, but backgroundtaskhost.exe still shows up when I search from the start screen.
Disclaimer: I am not a tech expert
So I was browsing some of the surface help sites (including this one) because my surface was getting slow. I believe it was due to the humongous error reports it was generating. I also was exploring the reliability report and found many many instances...