Permission Denied class-requests.php

i got an email from my host that my site was compromised and they changed permissions on a bunch of files. I uploaded the newest version of wordpress (except config and content) and made sure all the permissions are correct. However, when trying to log in (wp-admin) i get:

Warning: require_once(/home/xxxxx/xxxxx.com/wp-includes/Requests/Transport.php): failed to open stream: Permission denied in /home/xxxxx/xxxxx.com/wp-includes/class-requests.php on line 146

Fatal error: require_once(): Failed opening required ‘/home/xxxxx/xxxxx.com/wp-includes/Requests/Transport.php’ (include_path=’.:/usr/local/lib/php:/usr/local/php5/lib/pear’) in /home/xxxxx/xxxxx.com/wp-includes/class-requests.php on line 146

when i look at line 146, it just has :
require_once(dirname(__FILE__) . ‘/’ . $file . ‘.php’);

Any and all help is greatly appreciated!