Fatal Error with Plugin WPTextResizer

Hello world .

I am totaly new in the world of web designing and i came up with a problem .
I installed the plugin wpTextResize and i tried to activate it , it apperaed this message to my screen : ” Fatal error: Class ‘wpTextResize’ not found in I:\WORDPRESS\EasyPHP-12.1\www\wordpress\wp-includes\widgets.php on line 324 “

I dont have idea what this means . But from this moment i dont have acess to anything . it keeps apperaing this message . PLZ Help what happened?
I am running wordpress 3.5 on local . And had come to a good point for what i wanted to do in my web . and now its all gone .

I am getting realy worried .

THANK YOU