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    <p>Well, that's what you're supposed to do. Go to the command line and enter <code>echo %PATH%</code> and make sure your jruby bin directory is on there.</p> <hr> <h2>EDIT:</h2> <p>Ignore the above, that's not the error you'd get for jruby not being in the path. The "The system cannot find the path specified" error is because a path doesn't exist, most likely it's the path to your Java JDK. Run <code>echo %JAVA_HOME%</code>. Make sure that path is correct. If you don't have the Java JDK, you can <a href="http://java.sun.com/javase/downloads/index.jsp" rel="noreferrer">download it here</a>.</p> <hr> <h2>EDIT 2:</h2> <p>Having seen the output of jruby.bat, the problem appears to either be in finding <code>_jrubyvars.bat</code>, or finding something called within it. The only thing it calls is <code>_jrubyvmopts.bat</code>, which doesn't call anything else. Make sure that <code>C:\JRuby120\bin\_jrubyvars.bat</code> and <code>C:\JRuby120\bin\_jrubyvmopts.bat</code> exist, although I can't see a reason why they shouldn't. If they both exist, then the next step would be to remove the <code>@echo off</code> lines from each of them and see if we can find exactly where the bad call is taking place.</p> <hr> <h2>EDIT 3:</h2> <p>Having seen all that output, it looks like <code>JAVA_HOME</code> is set to "<code>C:\Program Files\Java\jdk1.6.0_11\bin\</code>" <code>JAVA_HOME</code> should be the parent directory: <code>C:\Program Files\Java\jdk1.6.0_11\</code>". Give that a try and cross your fingers this time.</p>
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    1. POThis is how I installed JRuby on Windows -> Why did it not work?
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    1. COYes. It's there.
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    2. COI also have Ruby (MRI) installed. Would that cause a conflict?
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    3. CONo. See my edited answer.
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