Installing CI framework is very straight forward.
First you need PHP and web server install on your server/PC. For development on windows, you can download and install WAMP.
Then go to CI website to download latest framework.
Copy the whole folders/files to your web server root folder. For example in wamp, you can copy to c:\wamp\www and create a folder name codeigniter
Then straight away test it on web browser. Example http://localhost/codeigniter
It should work correctly and you will be guided by on screen help on where to go from there.
For online help go to CI user guide. You can also found the localhost help in http://localhost/codeigniter/user_guide (use the folder name you install it on)
Tags: codeigniter, Tutorial