I used to use Python 2.7 and then IDLE was working. I uninstalled it and installed Python 3.1.
Right now Idle cannot launch. What should i do to get it running?

NOTE: I tried c:\Python31\pythonw.exe c:\Python31\Lib\idlelib\idle.py
i uninstalled 3.1 and installed back 2.7, not working neither...

I got the same problem on window 10. Steps to solve the problem:

1. Locate the .idlerc folder in your profile directory (e.g. C:\Users\{your-username} without the braces).
2. Delete the .idlerc directory.

It worked for me...