Corrupt access database: “Unrecognized Database Format”

Good!

I am using Microsoft Access 2007 to do my practices at home together with JAVA and VB.NET. I ran the program that I had made in VB.NET when out of nowhere it reproaches me with the title message... I tried to re-download the database that I had in my cloud and replace it, but I get another error other than this:

And if I try to open the one I have in my JAVA project I get the following (the hateful message):

Try to reinstall the access database driver for the 2007 version, but the error persists. I read somewhere that the 32-bit version of this driver doesn't cause this problem, only the 64-bit one... but I'm currently using the 32-bit one.

Do you know the funniest thing of all? Is that when I run the JAVA version of the program, it runs normally as if nothing was happening. On the other hand, if I execute the version of the program in VB.NET, at once it sings me with the second error. The other databases that I have from other programs are working normally... only this database has given me this problem that I don't know how to solve. I thought about creating it all again, but it doesn't even let me import data or see the relationships...

How could I solve this heavy problem?

Update

Upon request I leave the code of both connections, both in VB.NET and in JAVA:

VB.NET

Module ModuleH
    Friend conexion As New OleDb.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=Hospital.accdb;Persist Security Info=False;")

    Friend Sub ConectarBD()
        Try
            conexion.Open()
            MsgBox("Pulse aceptar para confirmar la carga de datos.")
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
        conexion.Close()
    End Sub
End Module

JAVA

Manager class (Here I initialize the UcanAccess driver and the DB address)

public class GestorDB {
private Connection conn;
private final String driver;

public GestorDB(String direccionDB) throws ClassNotFoundException, SQLException{
    driver = "net.ucanaccess.jdbc.UcanaccessDriver";
    Class.forName(driver);
    conn = DriverManager.getConnection("jdbc:ucanaccess://"+direccionDB);
}

public Connection getConnection(){
    return conn;
}

Administrator class (I load the address of the DB)

public class Administrador {
private GestorDB gestor;
private String idActual;

public Administrador() throws ClassNotFoundException, SQLException{
    gestor = new GestorDB("*******SaludParaTodos\\src\\Hospital.accdb");
    idActual = "";
}    

public Connection obtenerConexion(){
    return gestor.getConnection();
}

I re-emphasize what happens:

• I can't open the Hospital.accdb database in Microsoft Access 2007 itself (I get those error messages).

• The program written in VB.NET does not recognize the database (it shows the same message as in the second image), while the JAVA version of the program works completely.