1) begin Win2000 Setup from the Win2000 CD-ROM
2) when it gets to where it shows all the partitions and drives, delete all the partitions and then
press F3 twice to EXIT Windows Setup
3) now thems are all gone.

Start Windows Setup a second time and follow through. If you don't have firewall protection, it would be a good idea not to expose the system to a direct Internet connection like plugging it into a broadband modem. If you have a router to keep the worms and hackers off your back, that's good enough to get started with.