Ok,
In your list of installed programs in the Control Panel, is there 'MySQL' listed?
The error you are getting is because the database you are installing into has already been used before with an aborted installation and already contains the table its trying to create. As you can see in the error message.
As the command window reports an issue with MySQL, I have guessed that the installation of the Windows package partially failed because an existing installation of MySQL is already in existence. Or you are running another program that is using port 3306 (Web search TCP / UDP Ports) - ports are like having lots of outside doors to a property - web pages are served over port 80. Anyway too much to describe here.
Also, Moodle is not a simple program to install. Not because of design but because of what it has to do. It's not designed to be a single user, install and use, i.e. COTS. It is designed to be installed mainly in an environment where it will be accessed by lots and lots of users over a network. For this it has to support a range of scalable installations. And therefore employ robust scalable database technology. It also utilises a web server. So in effect it is an 'application' that operates with the support of third party supplied web server and database technology = a gluing together of Web Server (with PHP on top) and a database (usually MySQL). So in effect you are installing multiple applications (which are not normally installed by everyday computer users) which then have to be configured and work together properly.
Yes, it is possible to install on a device like a netbook but just requires a bit of learning of the more technical aspects.
You could try the Bitnami installer instead: http://bitnami.com/stack/moodle. But if you already have MySQL installed or another previous attempt / package / WAMP etc. running then it will fail. Un-install everything you have previously attempted to install, then reboot.