How do I stop my tablet from trying to install apps.

I have a M7XX, android 4.4.2. I got it real cheap from Amazon. So I shouldn't be to surprised that I've gotten what I paid for! It keeps trying to download all sorts of stuff and it slows the tablet down even more than what already is naturally. I've done a factory reset with no luck and I've also disabled the automatically download from unknown sources. I don't know what to do now. Anyone got any ideas?

Welcome to Android Central! What is it downloading? Are they apk files that are appearing in your Download directory? Did this happen as soon as you started using the tablet, or only after a while?