Win2K should have an FTP server available. You could put the video in a folder, make it accessible to the server, and your family could download it via FTP.
You’d have to leave your machine up and running while they got it (schedule it by email, maybe, or just leave it up for a few days).
If you don’t know how to set up FTP on Win2K (I don’t), you could have them install an FTP server on their machine, have them leave it running, and have you FTP the stuff to them. There’s a free FTP and web server that runs on Win9x (and perhaps others, so maybe it’ll work on Win2K) at www.xitami.com It’s not too hard to set up if you’re used to computers, but be aware that it’s one more thing for hackers to try to break into, so I wouldn’t leave it running in general.