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>>> import _tkinter
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ImportError: DLL load failed: %1 is not a valid Win32 application.
I 'upgraded' to python 2.6.5 by downloading the windows 64 bit installer. I'm running windows 7 64 bit. Everything worked great in 2.6.4 by the way. I had a similar problem with numpy, but reinstalling it from this site seemed to fix it:
http://www.lfd.uci.edu/~gohlke/pythonlibs/
I can only speculate what happened. If I knew what DLL failed to load I could easily check to see if there were dependency issues or 64/32 bit issues. Perhaps the old dll is still around? If so then there is an issue with the installer I think.
No doubt the issues extends beyond just Tkinter.