Subversion not available?

Hello I have tried using a SVN repository however the "Subversion" repository type never appear in my scroll down menu.

I have created a repository using TortoiseSVN, and also tried the following instructions : http://docs.unity3d.com/Documentation/Manual/ExternalVersionControlSystemSupport.html

Cleaned up multiple time my repository / folders commited etc... nothing work and it seems like everybody else has the option by default.

Here's a screenshot :

Anyone has a solution? Thanks :(