need help with ubuntu

hi guys
i have aproblem with ubuntu and that i can't download anything
because of this error

http://img121.imagevenue.com/loc215/..._122_215lo.jpg

and when i put df -h it shows this

http://img103.imagevenue.com/loc849/..._122_849lo.jpg


how can i fix the problem
i am new to linux

When u save it,save it in 1 of the desktop folders as there shortcuts to both drives.