APC PowerChute is included in Windows 2000.
If you are going to upgrade to Windows 2000, you must first:
1. Uninstall PowerChute.
2. Disconnect the UPS communications cable.
After the upgrade, connect the cable.
To configure the UPS, use the UPS tab in Control Panel / Power Options.
If you want the full PowerChute Plus, install PowerChute Plus 2.5 for Windows 2000.