>... now I just wonder what set the paths to
	>C:\usr\ruby\tcl\bin\tcl83.dll
	>C:\usr\ruby\tcl\bin\tk83.dll
	>
	>instead of
	>
	>C:\ruby\tcl\bin\tcl83.dll
	>C:\ruby\tcl\bin\tk83.dll
	>
	>Could that have been the work of the windows installer?

It could, if you were installing to \usr\ruby.
It's possible that if you installed in once to \usr\ruby,
then tried to re-install to \ruby that it doesn't update the
settings.

/\ndy