The easiest way to get rid of the adds in the W10 Start Menu is with Start10.
But say you haven't gotten Start 10 (not here!), there are other places it will appear: Your desktop and file explorer.
Here's a quicky video tutorial from TechRepublic on how to rid yourself of the nuisances: http://www.techrepublic.com/article/windows-10-gets-even-more-ads-heres-how-to-disable-them-all/?ftag=TRE684d531&bhid=23906934820265111040450294515746
Enjoy! And get Start 10. You won't be sorry.
You can read more about Start 10 and get it here: https://www.stardock.com/products/start10/
Source:
http://www.techrepublic.com/article/windows-10-gets-even-more-ads-heres-how-to-disable-them-all/?ftag=TRE684d531&bhid=23906934820265111040450294515746