Visual editor doesn't work

Hi, I am using wordpress 3.2.1, but I have noticed some days ago, that my visual editor doesn’t work. Because there are 2 tabs . one for visual and another for html. But I only see html, also in Visual tab it shows me only html code. I need to update my post and write new, but i can’t use visual editor.
I have tried in all the browser, changing theme, and disactivating all the plugins. I have moved back my wp-config to wp-admin directory. But nothing happened. I don’t know what to do ?
Can someone help me ?
Thanks a lot