Installing XNA
Download Visual C# Express 2010 here (it is free) (select your language and click 'Install Now')
Save the vcs_web.exe file to your computer and run it. Follow the default installation instructions.
Run Visual C# Express. If it doesn't ask you for a Registration code. Select 'Register Product' from the Help menu
Now.. Click the button to get a Registration code. You will be prompted to sign into your Windows Live account. If you don't have one, you must create one. (it is free) Put in the Registration code
Download XNA Game Studio 4.0 here (it is free). Save the XNAGS40_setup.exe file to your computer and run it. (it will automatically find your Visual C# installation and install). Follow the default installation instructions.
Creating Pong / Resources Needed for Pong
Getting Started with XNA Game Studio Development
Game Project Ideas
Doodle Jump clone
Slime Volleyball, Basketball, or Soccer clone
Rampage clone