Dim xlApp As Excel.Application, xlWbk As Excel.Workbook
Set xlApp = CreateObject("Excel.Application")
xlApp.Workbooks.Open "C:\aTest.xls"
Set xlWbk = ActiveWorkbook
With xlWbk.Worksheets(1)
.Cells(2, 2).Value = TextBox1.Text
End With
xlWbk.Close
Set xlWbk = Nothing
Set xlApp = Nothing