Perhaps you have hit the F8 key?

Do you see "EXT" on status bar? Hit the F8 key again to disable "Extended
Selection"

If using a wheel mouse, tap the roller a few times to clear.


Gord Dibben MS Excel MVP

On Thu, 6 Jul 2006 11:17:01 -0700, Butch Walker <Butch
wrote:

I'm working with Excel 2003. All of a sudden I can't highlight a single
cell. When I move the cursor with the mouse or an arrow key, a range is
created. I've shut my computer off and restarted it, but it continues to do
this. How can I get out of this?