I want protect my browser from possible attack

Hello, I use the virtual system to protect my browser but I need more protection about this situation. I configurate and the only thing that is conected in browser is tcp conection but I need a good configuration to protect my browser. If you show me how please or if you have a good method to aplicate it will be a good advice. One more thing, ¿why can remove the protection dns in comodo dragon?. I miss so much this protection and when I download comodo dragon is not inside the program…thanks and I hope your answer…