Hello,
You may already have the MS Intellipooint 8.0 or 8.1 drivers.
It has 50-75 different choices of mice after installation when you click on the Mouse applet in the Control Panel.
The optical comfort mouse 3000 in their list of choices lets you vertically scroll the center wheel, but not horizontally scroll it.
However the MS image of your comfort 3000 shows it can both vertically and horizontally scroll.
The optical comfort mouse 4000 and many others permits you to horizontally scroll.
Might try one of the other choices, like the 4000 and see if it will function properly.