Yeah, the problem seems to be with registry as every solution seems to be fiddling with registry.
I know that reinstalling OS is a really bad idea. But I have tried to find a way to solve this for months now. I have started a bounty on superuser also for the same in the question "Python IDLE disappeared from the right click context menu". And asking on these groups was the last thing I can think of. I uninstalled via the Control Panel. I installed via the official Python installer for Windows. I also don't understand how a start menu entry can begin an installation but it is doing just that. Now there seems to be 4 IDLE entries in my start menu. Two are valid (2.7.8, 3.4.2). The other two are previous installations of Python 3.4 that I did at different locations but removed later. I have stopped running IDLE from the start menu due to this. Because I am never sure whether it will re-install Python 3.4 at those old locations or not. Even right clicking those entries in start menu causes the installations to start. So I cannot even find the physical path of those entries. Maybe too much fiddling with the registry has caused it. Not sure about that. -- https://mail.python.org/mailman/listinfo/python-list
