Database verification failed

I have used EM client for many years with complete satisfaction. After I tried to restore my previous email after installing a new motherboard, it looks like EM clien got corrupted and not I cannot open EMclient. I get the message that the database verification failed.
I tried to delete the program completely, reboot the computer, reinstall and still get the same message. It looks like I cannot make a clean install. When I download, my antivirus is disabled. Checkdisk has not resolved the problem. What can I do?

System.Data.SQLite.SQLiteException (0x80004005): database disk image is malformed
database disk image is malformed
   à System.Data.SQLite.SQLite3.Prepare(SQLiteConnection cnn, String strSql, SQLiteStatement previous, UInt32 timeoutMS, String& strRemain)
   à System.Data.SQLite.SQLiteCommand.BuildNextCommand()
   à System.Data.SQLite.SQLiteCommand.GetStatement(Int32 index)
   à System.Data.SQLite.SQLiteDataReader.NextResult()
   à System.Data.SQLite.SQLiteDataReader…ctor(SQLiteCommand cmd, CommandBehavior behave)
   à System.Data.SQLite.SQLiteCommand.ExecuteReader(CommandBehavior behavior)
   à System.Data.SQLite.SQLiteCommand.ExecuteNonQuery(CommandBehavior behavior)
   à System.Data.SQLite.SQLiteCommand.ExecuteNonQuery()
   à System.Data.SQLite.SQLiteConnection.Open()
   à MailClient.Storage.Data.DataStore.GetConnectionInternal(String relativeName)
   à DbRepair.CorruptionChecker.CheckCorruption(RepairOptions repairOptions, CancellationToken token)
   à DbRepair.CheckingProcess.Check(CancellationToken token)
SQLiteCommandText: PRAGMA synchronous=Normal
databaseFile: Local Folders\task_index.dat

I got my own problems… but noticed your issue in my own travels. Did you look at the 5th paragraph on this page? ( it seems to give a  way to run emclient and force it to create a new database. Not sure if it will help you out.