Everybody, quit worrying about missing drivers. I joined driverguide.com (FREE) and not only did I just download the MN520 driver last night for my laptop, but have downloaded nearly all of my drivers from them for 3 years now. THey always have what I need.
Save the MN520 driver found at their site to a floppy. Then launch the file from the floppy in your laptop. It did not even require a reboot and my internet started working through my router instantly without needing any further settings.
I have my MN520 working at excellent cable modem speed in my 166mhz DEC laptop with only 97MB of ram. I am running 2000 pro, though. So I am not sure of other operating systems.
Seriously, get a free driverguide.com account and leave your worries behind. NO I do not work for them.