Ok so I got This IBM PC 300GL from my school. Its an old pentium3 model and It used to be on a network. I reinstalled windows 2000. And the computer booted fine. Using the IBM PC 300PL I had at home I OPENED the bois and in the start options I enebled the RAM check and disabled the option of booting into a network. Today i pluged the computer to the internet but at start-up after showing the IBM logo it says
client MAC address and its shows this / turning and a bunch of numbers. The computers at school do this to boot into the network at start-up. So i WENT into the bios and in devices and I/0 port I opened network setup and disabled active LAN or something like that but when I reboot the computer I still did it so I checked in the bios and It became active again. I turned on the other IBM pc 300pl running Xp (this one works fine I used it to configure the bios in the first one and this one has all the same parts but a newer motherboard and 200MHz processor BIGGER.) and in the same place the devices and I/0 Porst\network setup\and instead of active LAN it says Mac address and disabled. My question is how to disable the mac address on the computer with win 2000? It doesn't seem to have this option in that section. By the way Before I did enter the bios I had to reset the cmos jumper for it had a password.

Ps I don't know If this will help but here are my sys specks

533 Mhz processor
385 mb RAM
10.1 GB hdd
floppy
cd and cd burner(separate drives)

thanks in advance. Sounds like you didn't do a clean format and install...the bios THINKS its on a network thought not the os