I've literally JUST downloaded ruby from rubyinstaller.org.
Unfortunately I'm running windows 7 (too poor for mac).

My tutorial book says to type "ruby -v" into the cmd prompt to output
the version of ruby I'm running (v 1.9.3).

If I do this at the Command Prompt, it says "ruby is not
recognized as an internal or external command, operable program or batch
file"

But if I go into the ruby program file and open "Start Command Prompt
With Ruby" and type "ruby -v" then it outputs the correct version data.

Why is this?

Sorry I'm such a beginner.

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