That error is almost always caused by a bug in a driver, or a third party plugins.
If you have any third party plugins installed - disable them and see if the error goes away.
That looks like you copied several plugins from a previous version of Photoshop, and have several third party plugins.
Delete the ones you copied from a previous version - they can cause problems.
I expect that my son (who use this computer too but uses CS5.1 on his computer) maybe did something. I don't have any clue how to copy plugins and where to copy them...
Could you please let me know where I can found the plugins I should delete ?
In the Photoshop application folder, inside the folder named "Plug-Ins".
I removed the plug-ins folder and now it works !
Next step, reinstalling the plugins, step by step, to find out those who generates this issues...
Thanks for the help !