“… file is damaged or missing”
There might have been a power drop or blackout in your area that caused damage to your database. You have to retrieve the database from your last back up copy. It is essential to do a back up every night in order to diminish lost data.
“the trial period has expired”
To see this message, you must have reinstalled the system incorrectly or you are using a trial version. You need technical support to fix the problem.