Access to sub directory problem

I use CI 2.2.0. and php 5.5 in wamp server
I going to crazy with my project. 
on the default page for example http://localhost/myproject/ it work,.
but when I click link with url http://localhost/myproject/about/ it not work it display the index page of wamp server.
I have no solution to do it. canny one have idea with codeignitor version 2.2.0
thank you in davance