The currently installed driver for Kensington MouseWorks is not compatible with Microsoft Windows 2000 and will be disabled during the upgrade.
For a list of devices supported by Windows 2000, see the Microsoft Windows 2000 Hardware Compatibility List at http://www.microsoft.com/hwtest/hcl. Your Windows 2000 CD includes a copy of this list (drive:\Support\hcl.txt) that was accurate as of the date Windows 2000 was released.