Hi and welcome to ExTS
I don't have a Win2K machine so advice may not be quite correct - let me know if things are different.
Start > Run ....type in ....cmd ......ENTER
At the prompt type in ping 127.0.0.1 ( space after ping )
You should get 4 packets sent and 4 received - no losses.
Do you ?
I assume that you are using a wired connection.
Have you tried a different ethernet cable ?