Windows 2000, has many services which run at startup. some of these are not needed in a normal environment, but are needed when attached to a network with a domain. If your computer is not on a network with a domain, there are service syou can shut off, to free up resources.
If you check this link, it may help you cut down on the services you use to free up memory and resources....Just use caution with turning off services, you can make the system not work right if you turn off ones you do need.
http://www.systemsbysteve.com/winguides/w2kservices.htm
It may be useful in finding out what services you have, what they do, and if they are needed.
Alon