How to stop frequent unwanted apps downloading to my tablet?

[AC Question]

I have a Samsung galaxy tab 2. And every time I'm connected to the Internet, and app apk is download! Ads pop up on my screen. And also websites automatically pop up on my browser. I've located the apps that are doing it but the options to disable or delete app don't exist like they are legitimate Samsung apps when they are not. Yes! I already have Unknown Sourches dealt with. But they still download.

 

[alexzgr]

Also, I have downloaded multiple anti virus apps to run, but they don't find ****.

 

[Lizzie Smith]

did you solve this problem?
If so any advice would be appreciated. Thanks