OK thank you, I uninstalled & reinstalled, checking the three boxes at 
installation so now .rb files show up as ruby and not text files, etc.

so now i go to command and type "puts 1+2" and it's supposed to return 
"3" but it says instead:

'puts' is not recognized as an internal or external command, operable 
program or batch file.

What am I doing wrong? my tutorial book doesn't say this is a common 
problem. Does this have anything to do with running win 7 64bit?

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