You can check which version of Tcl/Tk that Tkinter uses by typing the following lines at the Python prompt:
Snack is accessed using the
tkSnack module located in the python directory of the source distribution.
You need to have the file tkSnack.py in your Python path. The installer should put this file in your Lib directory, search for it and move it by hand it this installation step failed.
If you have several versions of Python installed on your system the Snack installer will first look for the Python 2.2 installation and put the files there. Otherwise, it will search for version 2.1, 2.0, and 1.6. It will currently not install for multiple versions, so in this case you will have to move the files by hand.
A default installation of Python 2.2 and Snack on Windows might look like this (depending on were Python was installed):