Double-click each of the system update files, and then follow the onscreen instructions to install them.
Reinstall IntelliPoint Software
Insert the IntelliPoint software CD-ROM into your CD-ROM drive.
On the desktop, double-click IntelliPoint.
Double-click IntelliPoint Installer, and then follow the onscreen instructions to install the software.
If the preceding steps do not resolve the behavior, see the following Knowledge Base articles:
269046 You cannot click an icon by using the wheel button on a Macintosh computer
For additional information about uninstalling IntelliPoint software, click the article numbers below to view the articles in the Microsoft Knowledge Base:
247586 How to Remove the IntelliPoint Software for Macintosh