eM Client Crashes

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Every so often...Actually more often than not the application seems to crash unexpectedly when I have it minimized on my task-bar in Windows 7 32bit...When I did a crash report that application had crashed and checked the database. Upon running a database check I got another message asking me to run a debug report with the following:

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)

Not sure what the above means but if someone can help...I'd really appreciate it