problem installinf python

[abreed1 at maine.rr.com]

   Hi. I'm having trouble installing Python on my computer.  My computer is a 64-bit Dell desktop running Windows 8.1. 
   A screen message claimed that I installed Python 3.5.2 (64 bit), but when I try to run it, I get only the "Modify 
Setup" screen, with the only choices being "Modify," "Repair," or "Uninstall." I have run the "Repair" option, but that does not change anything. Can anyone help me install Python? 
   Alex