Excel 2007 sp1 with vista 32 business sp1

Background: When you highlight multiple non-contigious cells (i.e. hold the
control key down and select several cells that are not connected) Excel
highlights the selected cells in light blue.

Problem: This light blue does not show at all on many projectors. In some
case you can adjust the color temp and this helps. We do hundreds of
presentation in North America each year and can not control what projection
equipment we will be using.

Requested solution: I would change the light blue background that is applied
to selected cells to some other color or alternatively making the color
darker would probably work. Can this default setting be changed.

Thanks, Will