make sure gems/sources-x-x directory exists
maybe edit rbconfig.rb ('s) that exist, point them to your directory
where you installed it.

> 
> C:/ruby/InstantRails-1.7-win/InstantRails/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
> `gem_original_require': no such file
> to load -- sources (LoadError)
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