Once again, I would make sure you have Service Pack 3 of Visual Studio installed. And, I would verify that the port you are referencing is not in use by something else.

>First, I must apologize to VFP forum members for posting codes in VB. I am very much a VFP programmer but I have problem getting MSCOMM32 done in VFP.
>
>2 questions:
>1. How to get MSCOMM32 to work on VFP. I see a lot of OLE errors on the object property sheet.
>2. With reference to the following codes, I get error = Port already open and Portopen and subsequent system just waits on doevents. Any hint?
>
>Private Sub Form_Load()
> CommCtrl.CommPort = 2
> CommCtrl.Settings = "9600,n,8,1"
> CommCtrl.InputLen = 0
>On Error Resume Next
>If CommCtrl.PortOpen = False Then CommCtrl.PortOpen = True
>If Err Then
> MsgBox "There was an error opening the port. Error = " & Error$
>End If
>If CommCtrl.PortOpen = False Then
> MsgBox "PortOpen"
>End If
> CommCtrl.Output = "ATZ" + Chr(13)
> Do
> DoEvents
> InString$ = InString$ & CommCtrl.Input
> If InStr(InString$, "OK" & vbCrLf) Then Exit Do
> Loop
> Debug.Print InString$
> If CommCtrl.PortOpen = False Then
> CommCtrl.PortOpen = True
> End If
>End Sub
>
>
>>Are you sure you can open the port? Are you sure you have the correct port setting? I can use the control in both VFP and VB.
>>
>>
>>>>I have NT 4 SP3 and the MS COMM control works fine for me....
>>>>
>>>>>>>I meant CrystalComm. Can the MSCOMM control use KERMIT? I was told not.
>>>>>>>Marcus.
>>>>>>
>>>>>>I don't know if MSCOMM supports kermit. For something more sophisticated, I would check out www.mabry.com.
>>>>>
>>>>>Does MSCOMM works on WinNT 4.0 SP3? I didn't manage to get it working the last time I tried. Did you have any success?
>>>
>>>
>>>Do you have any idea why I can't open the port even when Port_open = False? I am using VB. Are you using VFP to call MSCOMM32?
>>>
>>>I test using:
>>>If mscomm1.port_open = false then
>>> mscomm1.port_open = true
>>>endif