When you say "detected", do you mean that is what the BIOS detected or
what Windows 2000 sees - or both?
I would first check that your motherboard BIOS will support more than
131GB. If the BIOS is more than a few years old, it probably won't -
check your motherboard manufacturers web-site for a later version.
The second thing you may need is the Microsoft Windows 2000 Large LBA
fix - from the support web-site.