When you are trying to install this system, there are some requirement:
1. Make sure your server has Zend Optimizer. If not, install it.
2. Upload all files via FTP in [Binary] transfer type. (This will solve the header problem)
3. Modify [config->config.php] with your database/MySQL password and make sure you have create a instance named [swift].
Then, you will be fine with the rest of your install process.