Excel & VB - Open method failed!

Dear gsmotherman...! :)
Below Code is Connection Excel and VB...
I want to help you by below program...

Option Explicit
Dim ExcelSheet As Object
Dim WorkSheets
Dim SampleCount As Long
Dim SampleTime As Integer
Dim Counter As Long
Dim ADData(999) As Double
Dim WorkSheet As Integer

Private Sub cmdEnd_Click()
    Dim FileName As String
    FileName = CurDir + "\" + txtFileName.Text + ".xls"
    ExcelSheet.SaveAs FileName
    ExcelSheet.Application.Quit
    Set ExcelSheet = Nothing
    End
End Sub

Private Sub cmdSet_Click()
    With ExcelSheet
        If WorkSheet > 1 Then
            .WorkSheets.Add
        End If
        .Application.Visible = True
        .Parent.Windows(1).Visible = True
        Dim N As Integer
        Dim XName1 As String, XName2 As String
        If SampleCount = 0 Then Exit Sub
        .WorkSheets(1).range("A1").Value = "Ƚ¼ö"
        .WorkSheets(1).range("B1").Value = "ÀúÀå"
        For N = 0 To SampleCount - 1
            XName1 = "A" + Format(N + 2)
            XName2 = "B" + Format(N + 2)
            .WorkSheets(1).range(XName1).Value = N + 1
            .WorkSheets(1).range(XName2).Value = ADData(N)
        Next N
        WorkSheet = WorkSheet + 1
    End With
End Sub

Private Sub cmdStart_Click()
    If cmdStart.Enabled = False Then Exit Sub
    SampleTime = CInt(txtSample.Text)
    If SampleTime <= 0 Then Exit Sub
    If SampleTime > 1000 Then
        SampleTime = 1000
        txtSample.Text = Format(SampleTime)
    End If
    SampleCount = CLng(txtCount.Text)
    If SampleCount <= 0 Then Exit Sub
    If SampleCount > 1000 Then
        SampleCount = 1000
        txtCount.Text = Format(SampleCount)
    End If
    Counter = 0
    cmdStart.Enabled = False
    cmdStop.Enabled = True
    tmrAD.Interval = SampleTime * 10
End Sub

Private Sub cmdStop_Click()
    tmrAD.Interval = 0
    cmdStart.Enabled = True
    cmdStop.Enabled = False
End Sub

Private Sub Form_Load()
    Set ExcelSheet = CreateObject("Excel.sheet")
    WorkSheet = 1
End Sub

Private Sub Form_Unload(Cancel As Integer)
    Set ExcelSheet = Nothing
End Sub

Private Sub tmrAD_Timer()
   
    ADData(Counter) = Int(99 + Rnd) + 1
    lblValue.Caption = Format(ADData(Counter))
    Counter = Counter + 1
    lblCount.Caption = Format(Counter)
    If Counter >= SampleCount Then
        tmrAD.Interval = 0
        cmdStart.Enabled = True
        cmdStop.Enabled = False
    End If
End Sub

Sorry! sliencing word...because im korean...
I want to content this program..have a nice day...

Im not sure what your trying to show me?
My code is working fine on some machines, and not working on others, so I believe that its a missing file, or a version problem.  I need to open an existing Excel (95 and/or 97) workbook and fill a combo with a list of its sheet names.

Thanks for trying,
Gary