I have a very similar question to this question. I have only one version of python 3.5 installed on my Windows 7 64-bit system. I installed Anaconda3.4 via official website
Anaconda installs python with it so whenever you are running python, you need to make sure you are using the one which anaconda installed. Use this command to know which python executable you are using right now. Keep the one installed by anaconda(typically inside anaconda folder) and uninstall any other.
where python