Banner advertisement inserted into all browsers

Question

My friend asked me to remove illegal banner ads inserted into all his computer's browsers. After looking at his browsers addons, remove them and reinstall them, I still cannot figure out what causes problems. Could you give me some suggestions for this. I don't really want to use aggressive approach to remove all browsers and reinstall them.

Here is the screenshot:

Answer 1

I don't know if the question should be ask here but try to delete them with Malwarebytes