I've installed Ruby using the one-click installer for Windows.
As said, I downloaded the zip package for RoR and unzipped it to my
local hard disk. There is no main install.rb for RoR, but there is one
install.rb for Actionmailer, Actionpack, Activerecord, ActiveResource,
Activesupport. How to I install RoR then? Should I install each module
separately by running 'ruby install.rd' in each directory?