If you cannot install the driver in System > Administration > Hardware Driver, you should install the driver manually.Visit http://www.nvidia.com/ and download the driver...
Open the terminal and typegconf-editorExtend the follow path/ > apps > metacity > generalThen select button_layoutModify the value of button layout, typemenu:minimize,maximize,closeThe : (colon)...
Open the Terminal and typesudo apt-get install gimp-resynthesizerThen enter your system super user password to download and install the gimp resynthesizer plug-in* This picture...