hen9, Experiencia de 10 años en manejo de programación en access,... 
                    
                        Debes de crear una funcion llamada Num2Text y pegas este codigo:
Public Function Num2Text(ByVal value As Double) As String
    Select Case value
        Case 0 : Num2Text = "CERO"
        Case 1 : Num2Text = "UN"
        Case 2 : Num2Text = "DOS"
        Case 3 : Num2Text = "TRES"
        Case 4 : Num2Text = "CUATRO"
        Case 5 : Num2Text = "CINCO"
        Case 6 : Num2Text = "SEIS"
        Case 7 : Num2Text = "SIETE"
        Case 8 : Num2Text = "OCHO"
        Case 9 : Num2Text = "NUEVE"
        Case 10 : Num2Text = "DIEZ"
        Case 11 : Num2Text = "ONCE"
        Case 12 : Num2Text = "DOCE"
        Case 13 : Num2Text = "TRECE"
        Case 14 : Num2Text = "CATORCE"
        Case 15 : Num2Text = "QUINCE"
        Case Is < 20 : Num2Text = "DIECI" & Num2Text(value - 10)
        Case 20 : Num2Text = "VEINTE"
        Case Is < 30 : Num2Text = "VEINTI" & Num2Text(value - 20)
        Case 30 : Num2Text = "TREINTA"
        Case 40 : Num2Text = "CUARENTA"
        Case 50 : Num2Text = "CINCUENTA"
        Case 60 : Num2Text = "SESENTA"
        Case 70 : Num2Text = "SETENTA"
        Case 80 : Num2Text = "OCHENTA"
        Case 90 : Num2Text = "NOVENTA"
        Case Is < 100 : Num2Text = Num2Text(Int(value \ 10) * 10) & " Y " & Num2Text(value Mod 10)
        Case 100 : Num2Text = "CIEN"
        Case Is < 200 : Num2Text = "CIENTO " & Num2Text(value - 100)
        Case 200, 300, 400, 600, 800 : Num2Text = Num2Text(Int(value \ 100)) & "CIENTOS"
        Case 500 : Num2Text = "QUINIENTOS"
        Case 700 : Num2Text = "SETECIENTOS"
        Case 900 : Num2Text = "NOVECIENTOS"
        Case Is < 1000 : Num2Text = Num2Text(Int(value \ 100) * 100) & " " & Num2Text(value Mod 100)
        Case 1000 : Num2Text = "MIL"
        Case Is < 2000 : Num2Text = "MIL " & Num2Text(value Mod 1000)
        Case Is < 1000000 : Num2Text = Num2Text(Int(value \ 1000)) & " MIL"
            If value Mod 1000 Then Num2Text = Num2Text & " " & Num2Text(value Mod 1000)
        Case 1000000 : Num2Text = "UN MILLON"
        Case Is < 2000000 : Num2Text = "UN MILLON " & Num2Text(value Mod 1000000)
        Case Is < 1000000000000.0# : Num2Text = Num2Text(Int(value / 1000000)) & " MILLONES "
            If (value - Int(value / 1000000) * 1000000) Then Num2Text = Num2Text & " " & Num2Text(value - Int(value / 1000000) * 1000000)
        Case 1000000000000.0# : Num2Text = "UN BILLON"
        Case Is < 2000000000000.0# : Num2Text = "UN BILLON " & Num2Text(value - Int(value / 1000000000000.0#) * 1000000000000.0#)
        Case Else : Num2Text = Num2Text(Int(value / 1000000000000.0#)) & " BILLONES"
            If (value - Int(value / 1000000000000.0#) * 1000000000000.0#) Then Num2Text = Num2Text & " " & Num2Text(value - Int(value / 1000000000000.0#) * 1000000000000.0#)
    End Select
End Function
Salu2,
Henry