1. First of all search the svn software for windows.
You can directly go to http://tortoisesvn.net/ and then downloads directory.
2. Install TortoiseSVN-(....).msi software on your PC
3. Create the folder where you want to have your project files. Then right click on it and select TortoiseSVN → Checkout
For example: Goto → My Documents
→ then right-click with the mouse on an empty spot
→ then click on SVN Checkout