WP-Admin Screen changed

I’ve taken a screen shot of what my wp-admin screen now looks like:

http://img.photobucket.com/albums/v639/dylanesque22/Picture1.png

I dont know whats happened. I deleted a file wp-amazon-plugin from the wp-admin folder and suddenly everything changed. Im sure i havent deleted another file by mistake.

Please can anyone help me out?

Thanks in advance…