Can't install Ruby on Rails on Wamp

I followed this tutorial:

How to install Ruby on Rails alongside WampServer?

After adding D:\wamp\ruby\bin (my wamp folder is in D:) to my Path and write gem install rails in the comman开发者_如何学运维d line I get 2 error which says that the following files couldn't be found:

SSLEAY32.dll
zlib.dll

Here is the screenshot:

Never mind it is fixed by downloading some dlls http://alwaysthecritic.typepad.com/atc/2009/03/install-ruby-191-on-windows.html