1.
Create a new environment for 32bit Python 2.7: set CONDA_FORCE_32BIT=1 conda create -n py27_32 python=2.7 Activate it: set CONDA_FORCE_32BIT=1 activate py27_32 Deactivate it: deactivate py27_32
2.
Create one for 64 bit Python 3.5: set CONDA_FORCE_32BIT= conda create -n py35_64 python=3.5 Activate it: set CONDA_FORCE_32BIT= activate py35_64
3.
I would recommend you to use Miniconda3 64-bit as your root environment. You can always install a full Anaconda later with: conda install anaconda