A run-time error occur when Excel open a connection to an Access 2007 table

[Lynn100]

EXCEL 2007. ACCESS 2007

In Excel, when I click a button the code suppose to connect to an Access
database and retrieve data from a table.

Run-time error '-2147467259(80004005)':Microsoft ODBC Driver could not
find file '(unknow)'.

Con.Open <------ Yellow highlight when the error occur

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Private Sub CommandButton1_Click()

Dim Con As New ADODB.Connection
Dim RS As New ADODB.Recordset

'Drive code for access
Con.ConnectionString = "DBQ=C:\To_Be_Used_By_Excel.accdb; " _
& "DRIVER={Microsoft Access Driver (*.accdb)}"

'Open the connection Con.Open
Con.Open <------ Yellow highlight when the error occur
Set RS.ActiveConnection = Con
RS.Open "Select ' from Table_Name"
StartRow = 3

Do Until RS.EOF
'First Field
Cells(StartRow, 4) = RS.Fields(0).Value

RS.MoveNext
StartRow = StartRow + 1
Loop

RS.Close
Set RS = Nothing

Con.Close
Set Con = Nothing

End Sub