Installing dm-types on Windows. (Win7 x64)

Question

I am trying to install dm-types for DataMapper on my machine with

gem install dm-types 

I\'ve installed Ruby from RubyInstaller (1.9.3) a

Answer 1

What Mayro said was right on the money, the thing I had to look out for was that In addition to the user PATH the link to the DevKit was also in the System Variables PATH which had the link that was causing my problem.