> OK, so have you checked the option that I mentioned before during the
> installer?
>
> [x] Add Ruby executables to the PATH
>
> Have you started another command prompt after that?

Yes to all

>
> After you install and check that box again, can you open a new command
> prompt and execute the following?
>
> C:\Users\Luis>REG QUERY "HKCU\Environment"
>
> You should see a key in the output like this:
>     PATH    REG_EXPAND_SZ ...
>
> What is the output in your case?
>

There was no PATH in the output. However, I followed the steps in 
Jaxxa's response, created a user variable PATH, and that seems to have 
sorted things!

Thanks a lot for all your help.

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