Hi, Seems like an issue with IDLE on Windows 10 with Python 2.7.10 active Python distribution. I'm able to open IDLE but it crash immediately. Try with deleting .idle.... folder but it couldn't help. Then I moved backed to 2.7.9 version which ultimately helps to get it invoked from machine. Kindly reproduce and check the 2.7.10 distribution with windows 10 64 bit. Thanks Jatin Miglani
By 'active Python distribution', do you mean 'ActiveState Python distribution'? If so, you should talk with ActiveState. The 2.7.10 64 bit PSF installer works fine on my machine. Was Win 7, now Win 10. In any case, try "python -m idlelib" at a command line and see what error message you get.
'Crash' means getting a Windows 'Application stopped running' box as opposed to Python merely stopping with no error message when started from an icon.