My new Dell desktop 537S came with a wired optical wheel mouse.  The wheel feels like it has a switch.  When I open the mouse software (XP PRO) it shows a wheel switch and lets me chose "Back" for the switch function.  But choosing BACK doesn't work.  The wheel switch seems to activate a form of scrolling.

The same thing applies to a Microsoft wireless optical mouse left over from my earlier Dell computer.  The wheel switch won't cause "back" even when selected in the software.

Any ideas for me??