Thanks a lot for the tip. This revealed that Python 3.4.3 was looking 
for tcl from Python 2.2 on my machine. That version had been on my 
machine more than 10 years ago, but was no longer there. It had left 
behind a whole bunch of registry crumbs, which I removed. I then 
uninstalled all the versions on my machine and reinstalled 3.4.3. That 
did the trick. The question is, why would installing 3.4.3 or other 
versions be contaminated by stuff from another version, especially an 
ancient one?

Jack

On 8/14/2015 8:49 PM, Terry J. Reedy wrote:
> Terry J. Reedy added the comment:
>
> For 3.4.3, run 'python -m idlelib' in the command window and you should see some error message.  But first run 'python' and at the>>>  prompt, 'import tkinter' to see if tkinter is working properly.
>
> ----------
> nosy: +terry.reedy
>
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> <http://bugs.python.org/issue24868>
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