Idle no longer works

[Opap-OJ]

I can no longer open the Idle IDE for Python on Windows 7.

For 3-5 years I used Idle for all my python work.  But in January this happens:

When I right click on a python file and choose "open with Idle" nothing happens.

If I double-click on the file itself, it briefly opens an MS-DOS looking window, then closes it immediately.

I tried installing Eclipse with PyDev.  It opens the file, but will not run it in Python.

Any idea why?