Cannot login to admin

I cannot seem to login to the wp-admin portion of the website. Website is visible, but when I try to login to https://michaelsemora.com/wp-admin I get this message:

Warning: require_once(/home/content/64/8059264/html/wp-admin/includes/admin.php) [function.require-once]: failed to open stream: No such file or directory in /home/content/64/8059264/html/wp-admin/admin.php on line 67

Fatal error: require_once() [function.require]: Failed opening required ‘/home/content/64/8059264/html/wp-admin/includes/admin.php’ (include_path=’.:/usr/local/php5/lib/php’) in /home/content/64/8059264/html/wp-admin/admin.php on line 67

Thanks very much for any help you can provide. I tried to use wp e-commerce and upload a file larger that 32M and this is when this problem occured.