Rails - Apr 2008 - Installing Instant Rails over existing Ruby Installation

I just installed Instant Rails on my Windows machine.  I previously had
Ruby already installed, and now I seem to have two copies of Ruby, one
in the Instant Rails folder, and my original one in the Ruby folder.  My
question:

1) Is it necessary that I have two separate copies of Ruby?

2) If not, how do I effectively merge the Gems that I have been using
with the first copy of Ruby into the copy that is in the Instant Rails
folders.  I would rather have just one copy to maintain and work with.

Thanks,

Alex
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