VBSCRIPT To Read / Update And Save?

All I am trying to do, is read an Excel file looking for the next cell to update, then update it and ultimately save it.

I cannot get it to work - all the checking says it should and yet it doesn't. I have included my simple code but not being a programmer, I just need this to work. The whole Excel VBSCRIPT is a mystery to me as to when methods etc can be used.

here comes the code

Set objXL = CreateObject("excel.application")
Set wbDest = objXL.Workbooks.Open(pathName & xlFile)
Set wksDest = wbDest.Worksheets("SpeedLog")
xlFindColCount = 1
Do Until wksDest.Cells(1, xlFindColCount).value = ""
xlFindColCount = xlFindColCount + 1

[code].....