The selected area grows when I click a cell or press keys to move.

[yendorexcel]

The F8 function key seems ineffective in turning of the extended-selection
function.
I'm using Excel 2000 SP3
I should by grateful if someone would advise me how to terminate this feature.

 

[Debra Dalgleish]

You could try downloading and installing a new version of the mouse
driver, if one is available from the manufacturer's web site. Or, try a
new mouse and driver on the machine.

David McRitchie also has some suggestions on his web site:

http://www.mvps.org/dmcritchie/excel/ghosting.txt