Your post doesn't mention if you or Dell installed 2000. Or if you installed all Dell's drivers. Many laptops require a motherboard driver which Microsoft will not fetch, note or show indication it's needed. You have to find or install such.
I have a dell lattitude 610 runnint windows 2000 pro
5.00.2195 service pack 4
I have a dlink router that works fine with my other two computers with a cable hookup and my dads laptop by wireless connection
my laptop will work fine when attached by hardwire but not by wireless. the computer shows a strong signal but cannot access the internet
I have tried deleting the driver for the wireless card and reloading to no avail
Thanks for any info you can share