Error 404 url wrong

Hello,

I got an error when I try to register on my joomla 2.5 website with CB Login.
The problem is address (joomlawebsite.com/index.php/component/comprofiler/registers) give an error 404.

If I write joomlawebsite.com/component/comprofiler/registers so that's ok.

I don't see any way to force remove this 'index.php' in address.

I use 2.5.4 joomla and last version of CB (1.

Best regards,

Jérôme

Resolved with active (url rewriting in live set to Yes in Joomla -> configuration -> system)