Help me please

Hi. My website is and today when i tried to check my website and when i tried to login in my admin account, this error appear to me:

Warning: require(/home/ugeez/public_html/wp-includes/load.php) [function.require]: failed to open stream: No such file or directory in /home/ugeez/public_html/wp-settings.php on line 21

Fatal error: require() [function.require]: Failed opening required ‘/home/ugeez/public_html/wp-includes/load.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/ugeez/public_html/wp-settings.php on line 21

I would like somebody help me fixing this problem and tell me why this is appearing now. Thank you so much