Not sure what version of windows you're on, but...
Right click "My Computer" and select properties.
Select "Advanced" tab.
Select "Environment Variables" button.
Add the path of the ruby \bin folder (don't quote me on this, I don't know Ruby but I do know Java/others and it's probably the same)
Accomplish this by finding the "path" variable in the "system variables" section, and add in there something like ";c:\program files\<ruby install folder>\bin" or some such thing.
You need the semicolon as a separator in there.
Make sure to close your command window and reopen it. You can verify it was added by typing "path" at the command prompt, see if it's there.
If you add the right path, it'll find it.
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