I was using this program and was working OK before I switch to windows 2000 ( i was using windows 98 before) :

Private Sub Form_Load ()
' Use COM1.
Comm1.CommPort = 1
' 9600 baudios, paridad ninguna, 8 bits de datos y 1 bit de parada.
Comm1.Settings = "9600,N,8,1"
' Indica al control que lea todo el búfer al usar Input.
Comm1.InputLen = 0
' Abre el puerto.
Comm1.PortOpen = .t.
' Envía al módem el comando de atención.
Comm1.Output = "AT" + Chr$(13)
' Espera a que retornen los datos al puerto serie.

' Cierra el puerto serie.
Comm1.PortOpen = .f.
End Sub

After I switch to windows 2000 I started getting the following error in the line "comm1.PortOpen=.t." The device is not open. Any advice. thanks