I fixed my issue.

I went directly to:

http://rubyforge.org/frs/?group_id=2103

.. and downloaded the ruby-opengl-0.60.1-x86-mswin32.gem
.. ran gem install ruby-opengl-0.60.1-x86-mswin32.gem
..
.. And it installed correctly with no issues.

I looked through your links though and the second one was very well 
written - I especially enjoyed your ideas about user file separation on 
a different partition.

Good read!
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