eM CLient wont open, crashes repeatedly

Frequently can’t open the client. Sometimes crashes. Restarting the pc helps maybe 1 time, then repeat. Here is the error message.

System.Data.SQLite.SQLiteException: The database file is locked
database is locked
at System.Data.SQLite.SQLite3.Step(SQLiteStatement stmt)
at System.Data.SQLite.SQLiteDataReader.NextResult()
at System.Data.SQLite.SQLiteDataReader…ctor(SQLiteCommand cmd, CommandBehavior behave)
at System.Data.SQLite.SQLiteCommand.ExecuteReader(CommandBehavior behavior)
at System.Data.SQLite.SQLiteCommand.ExecuteNonQuery()
at System.Data.SQLite.SQLiteConnection.Open()
at DbRepair.DbTools.OpenConnection(String fileName)
at DbRepair.Form1.CheckCorruption()
at DbRepair.Form1.Check(Object state)


This means that database is used by another program and eM Client can’t access it, do you have it by any chance in backup process by external tools or “protected” by antivirus or some other tool?