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If you want multiple python versions installed, during a python installation, do not 'check' the option to 'set as default' for any python version. To activate a version, open a CMD window, set the environ variable "PYTHONHOME" to the path of the python version to be activated (like PYTHONHOME=c:\python27)

On situations like yours, I would uninstall all python versions and PSSe versions as well, then install them back. Every python installed should allow for adding additional modules using pip, else something went wrong.