I had this same problem on my Toshiba Laptop (running Windows XP) and found
the following solution:

Open the control panel open the mouse settings click the hardware tab
click the properties button.

Observe the new dialog open click the advance settings click the "wheel
detection" dropdown set it to "detection disabled" cick OK reboot.

Note that my original Wheel detection settings were "Assume Wheel is Present".

Hope it helps




"Gord Dibben" wrote:

A common cause of this is that you are in "Extended" or "Add" mode.

If you see "EXT" or "ADD" down on the status bar try hitting F8 key a couple
of times.

F8 will will toggle you in and out of Extended mode. SHIFT + F8 will put you
in "ADD" mode.

With the "ADD" mode you need to re-click the mouse. This is used to select
non-contiguous cells and ranges without using the CTRL key.

With the "EXT" mode you just click once and drag. All cells will be selected.

If you are using a wheel-mouse tap the wheel a couple times.

Also see David McRitchie's "Ghosting" at

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


Gord Dibben Excel MVP

On Mon, 11 Apr 2005 09:17:08 -0700, "screwie"
wrote:

Hi all,
This morning when I started my Excel 2003 and I tried to work the worksheet
I found that when I pressed the left mouse button it would select various
cells (as if the SHIFT key was pressed all the time.
Tried to turn the Scroll/Num Lock OFF and it didnt work. This is on a
portable computer. I have had this problem before but cant remember how I
fixed.

Help please