I guess you have your prefs set up for eMail responses so I'll just cut-n-paste what I wrote before.
redundancy is bliss
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I'd go to the dell website and puul up the manual for your machine to verify if that yellow jack is in fact a composite video input. Most of the time, these are composite video outputs so that you can hook up a TV as a shadow monitor. (very good for PP presentations). Dells phone support is very good at telling you what you wanna hear to get you off the line IMO.
The yellow ended cord you described is a composite video cord.
It should be pretty easy to verify if in fact you do have a video car that is capable of capture. right click on the desktop, select properties, click on the settings tab, and click on the advanced button. There should be a tab with capture setting if you do in fact have a capture device.
Your next obsticle is software. A good place to start is Ulead Video Studio. It's a hundred bucks but there is a 30 day free trial that is fully functional.
http://www.ulead.com/vs/runme.htm It's a very basic application and you can build DVD's with it. A very good "get your feet wet" beginner video editor application. I still use this application for capture most of the time because it's fast and easy. I have moved on to 2 of their other products, Media Studio and DVD Workshop.Those 2 are a little hairy, not to mention 3 & 4 hundred bucks respectively, but worth every cent.
I do a lot of video editing and am happy to give you hints. I visit this site pretty much once or twice a day. I'll try to watch for this thread.