If you have your prestashop in subfolder and you want move it to root, you have to:
- Copy/paste all files to root
- Change configuration (config/settings.inc.php) file
- Change this line define(‘__PS_BASE_URI__’, ‘/subfolder/’); to define(‘__PS_BASE_URI__’, ‘/’);
- If you are using user friendly url you have to edit your .htaccess file
- Open .htaccess file with text editor
- Delete subfolder string from all lines
It should be enough to move your shop to root directory.