I also have sporadic advertisements on my start bar (when I press the win key), sometimes it suggests an app, which looks just like any other app, the only diff

I also have sporadic advertisements on my start bar (when I press the win key), sometimes it suggests an app, which looks just like any other app, the only difference is a "SUGGESTED" header which is easy to miss. I assume when you click on that, it opens the store app. It appears at the very top and AFAIK there's no way to disable it.