Can't connect to MySQL server on '127.0.0.1' (10061) (2003)

If you have already installed MySQL on a windows machine make sure it is running as a service.. You can do that by

Start --> services --> MySQL(ver) --> Right-Click --> Start

Looks like the mysql server is not started.

Look to the official documentation of MySQL how you can start a service under windows.

Install the server as a service using this command: C:> "C:\Program Files\MySQL\MySQL Server 5.5\bin\mysqld" --install

I was facing the same problem, but what I did not realise is that I did not have the MySQL Server installed. You must simply install the MySQL Server.

In order to install the MySQL server, you must run the "MySql Installer" and then press the "Add" button and then choose the "MySQL Server" in the tree.

After doing that, run you workbench again and you'll notice that there'll already be a connection configured. Hopefully, you'll be able to create a new connection or as many connections as you want.