i believe Windows 2000 has a 'bandwidth throttling' feature built in. It's the QoS packet scheduler driver.
You can limit a network cards bandwidth usage. not sure if that will help you but I thought others might find the tip usefull
http://searchwin2000.techtarget.com/...my=%2Fpr%2F5e3
has info on it.
Happy Trails
PooterMan