Image Widget Missing and Widgets Reset

Hi there, I want to make use of the Image Widget seen here: http://en.support.wordpress.com/widgets/image-widget

The problem is i don’t see it when I go to Appearance>Widgets. I have a bunch of others like Text, Calendar, Pages, RSS etc etc.

Why isn’t the images widget there? Where can i find it? I want a widget not a plugin. This would be the perfect widget for my needs.

Another thing. I have sidebars and when i add text to them via Appearance>Widgets, its fine. But when i refresh that page, it resets the text for the sidebar to nothing. Any ideas why?

Thanks alot for any help