title: How come when I run ruby.exe / IRB all I get is a blank DOS shell?
body: <p>I installed ruby 1.9.1p243 (2009-07-16 revision 24175) [i386-mingw32] on my Windows XP laptop.</p>
  
  <p>When I run ruby.exe I get a blank DOS Shell window. No expected "irb(main):001:0>" at the top left of the command prompt. I can type into the shell but, any code I type in actually does anything when pressing enter. </p>
  
  <p>I should mention that I can start IRB from the cmd.exe DOS shell and it functions perfectly. Additionally I have the System Variables path set to c:\ruby\bin so I know that is ok. </p>
  
  <p>Any ideas what could be going wrong and how to fix it?</p>