I installed wordpress into a folder called ‘wordpress’, and developed it there. Now I am wanting to move it to the main index, so that when people visit my website they will automatically go to my installed wordpress.
Do I have to delete all of my old pages?
Will I need to update any of my wordpress files to the new URL?
Thanks for any help and advice 
Check out this page for easy step-by-step instructions:
http://codex.wordpress.org/Moving_WordPress