"Run laptop from router": What do you mean?
"connect": to Internet, to other computers in the network?
What are the error messages?
How is the wireless receiver connected (USB or NIC)?
How is the laptop hard-wired to the modem (USB or NIC)?
What does winipcfg (that's the Win 98 program, it might be called otherwise on Win2000) say and do?
WinXP has a network troubleshooter. But I don't know if a 'professional' OS like Win2000 has it (or relies more on competent professionals managing it). But using WinXP to guide you through the Win2000 setup is possible.
With the little you tell it can be a hardware problem, a software (driver, protocol) problem, or a wrong setting somewhere on the laptop. Maybe the information on www.wown.com will point you the right way.
Hope this helps.
Cannot run my laptop (Compaq Nx5000, OS Win 2000 NT) from router, nor can I connect when I hard-wire laptop to DSL modem. Replaced modem and router. These devices work from my PC where they are hard-wired. PC (Dell) is running on Win XP. Any suggestions?