Go to the automatic Plesk backups and restore the latest backup containing the missing tables.
Open a connection to the Plesk database and add the missing tables.
If the table already exists, while at the same time not listing under show tables, then restore the table to another database, move the .frm file in the folders, then drop from the cmd, before then creating it in the right home
The PHP handler “fastcgi-5” is not registered
Run php5.msi and choose Repair
Add a PHP handler to exec the appropriate php-cgi.exe