How do I permanetly remove farm slots on my tablet?

I just bought this tablet and installed Candy Crush saga, and gin rummy and also tried Killshot but I never got it running, as it would crash while loading weapons, and after I installed the last one (killshot) I keep getting popup adds that take over the entire screen, and I have to wait for it to load, and hit the "X" on the upper right, and half the time it will shut off my browser which is usually FireFox.
I have deleted all the games even did a factory reset, and the adds are still there and keep taking over and I cannot get anything done on the net..as I get these popups every couple mins or everytime I click on a link. I have to assume that it has to be in the google cloud because as soon as I reset my tablet and got the wifi setup at the location, I got a popup for Clash of Clans or some other game that I do not care about. and I keep removing the "farm slots" icon from my home screen, after a reboot, the icon will be there again.
Do I have to sue someone to get rid of this malware crap? I do not have the mysterious "network" in my app list.. I have adobe flash player 11,airpush detector(which does nothing), com.example.videotest ( <have no clue what it is),Dragonfire v2.2,Dragonphone,Google Play Books,Google Play srvices,Google Play Store, Firefox,Gin Rummy free,and Addblock plus Kaspersky edition. That's it. Do I need to root my tablet to get rid of this nonsense? I cannot get anything done on the lnternet with my tablet which is why I bought it. I am about ready to toss the tablet

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