ERROR MESSAGE

I already have my own domain. When I checked my account, I could no longer log in.. Please help! How do I retrieve all of my files? Thanks!

This is the error msg:

Warning: require(/home/vinsmira/public_html/wp-includes/compat.php) [function.require]: failed to open stream: No such file or directory in /home/vinsmira/public_html/wp-settings.php on line 246

Fatal error: require() [function.require]: Failed opening required ‘/home/vinsmira/public_html/wp-includes/compat.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/vinsmira/public_html/wp-settings.php on line 246