Hi,
You've found an (annoying) issue with Excel that plagues many! You need to run some VBA on it (Visual Basic for Applications - e.g. aka a macro). A simple routine such as ...
This particular code was written by DRJ and can be found here: http://www.vbaexpress.com/kb/getarticle.php?kb_id=83
The code in the link was written to do all sheets in the workbook. The link also has instructions, a description, how to steps and a downloadable example file. Another very quick method would be to download/install ASAP Utilities (www.asap-utilities.com) which has a routine for this. Very simple, very quick. A lot of additional 'goodies' are contained with that add-in as well.
Run this code (Alt + F11 --> Insert --> Module, paste on right, press F5 to run) to reset the lastCell in Excel.
HTH
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