Microsoft.ACE.OLEDB.12.0 provider is not registered

private class AdminDatabase
   ' stores the connection string which is set in the New() method
   dim strAdminConnection as string

   public sub New()
   ...
   adminName = dlgopen.FileName
   conAdminDB = New OleDbConnection
   conAdminDB.ConnectionString = "Data Source='" + adminName + "';" + _
       "Provider=Microsoft.ACE.OLEDB.12.0"

   ' store the connection string in strAdminConnection
   strAdminConnection = conAdminDB.ConnectionString.ToString()
   My.Settings.SetUserOverride("AdminConnectionString", strAdminConnection)
   ...
   End Sub

   ' retrieves data from the database
   Public Function getDataTable(ByVal sqlStatement As String) As DataTable
        Dim ds As New DataSet
        Dim dt As New DataTable
        Dim da As New OleDbDataAdapter
        Dim localCon As New OleDbConnection


        localCon.ConnectionString = strAdminConnection

        Using localCon
            Dim command As OleDbCommand = localCon.CreateCommand()
            command.CommandText = sqlStatement
            localCon.Open()
            da.SelectCommand = command
            da.Fill(dt)
            getDataTable = dt
        End Using

    End Function
End Class