The ruby/rails/ruby installer has many bugs in Windows 8. If you don't install Ruby in the exactly folder as is suggested, (e.g.: if you install in something like "d:\my apps\ruby"), it won't work, because the installer have trouble dealing with special characters, with whitespaces in the path, with more than 8 characters in the folder name (reminds me the old ms-dos), and I guess that some lines in the source-code has this default path explicitly written.
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