Installation isuue

I need help with installation .
Every time i install this page is showing up , that i have attached .
Even though i have done all three , but still this is coming up

Looks like you are running the python install program multiple times.
Now that you have python installed you do not need the installation program any more.

To run python type this into a terminal or cmd window at the command line prompt:


That will get you to the python prompt.