Use composter to install symphony:
Install Composer: download composer at https://getcomposer.org/ and setup it.
First install wamp at your computer, say you have installed wamp at D:/wamp, and have run it.
Create a fold, named symfony, and install symfony under it, run windows command cmd, and run:
composer create-project symfony/framework-standard-edition my_project_name
After you have successfully installed symfony, and run:
php bin/console server:run
Then, open your browser and access the http://localhost:8000/ URL to see the Welcome Page of Symfony!