It's pretty basic, but you can't go wrong with it.
Here's what you need:
1. Firefox - You can downlod it here:
http://www.mozilla.com/firefox
2. A extension called VideoDownloader:
https://addons.mozilla.org/firefox/2390
The good thing is that it will work in most of streamming video sites, like YouTube, Google Video and many others:
Step by Step:
1. After installing the extension for Firefox you'll see this new icon on your status bar:
http://addons.mozilla.org/images/previews/videodownloader-1.jpg
2. Just click on it, when you're on the video page and this window will pop up:
http://img530.imageshack.us/img530/2900/videodownloader3cv.jpg
3. Than you just have to select the place to save it and it's done.
Some streamming videos (like YouTube) will need to be converted into another format to run on WMP, but that should be easy for you ![]()
Hope that might help you guys.

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