I am new to programming and i decided to learn Python first, so;
I installed Python, latest version 3.4. and I am trying to open Python IDLE(GUI) mode, so when I open I get message "IDLE's subprocess didn't make connection. Either IDLE can't start or personal firewall software is blocking connection.". 
My firewall is not problem beacuse I put Python throught it. I also tried to reinstall it and it didnt made diffirence. So please if somenone can help! 
Thank you on your time :D
Just had the same issue.  So uninstalled and reinstalled which fixed it and took 10 minutes.  The key with Windows machines is delete the old directory (C:\Python27\ because windows does seem to actually delete things) and when reinstalling specify a new directory (C:\Python279\ or whatever you choose to call it).
I am using Win 10 with Python 2.7.9.
Python error - IDLE's subprocess didn't make connection. Either IDLE can't start or personal firewall software is blocking connection