try this article. make sure you have a backup of your database as it is now before making these changes.
An alternative is to restore the database backup you made before running the security scan. That would put you back where you were before you ran the security scan. If you restore you will have to change one line in the wp-config.php file related to database table prefix, back to what it was before the security scan changed it. (I assume it changed it - use PHP My Admin to see what the prefix on your database tables is now, and make sure wp-config.php has the same prefix on the line "$table_prefix =" If it doesn't, change it in wp-config.php to what it is in the database - that may solve your problem. If you don't know, wp-config.php is a file in the root folder of your WordPress installation).
If you need to restore your webhost may help. Or you can do it yourself in PhpMyAdmin. You can find tutorials on Google.
Just be certain you make another backup of the database the way it is now, and that you know which backup is which.