Ok basically you need an AV splitter that has both S-Video and AV from your Xbox. S-Vid goes into your CC and the AV goes into ya TV. Thats the way I used to do it. If you need pics I have some to show you what to do
OK heres some pics:
Direct Setup
TV/ Computer Setup
If you want you can split the signal and have the video sent to the TV and your computer at the same time you can by using the leads shown above.
Just connect the Xbox yellow video lead and the Video Phono Lead into the Phono Splitter and then plug the Splitter into the Capture Card and the Video Phono Lead into the TV.
Now you should be able to capture video and audio from Halo while still able to use the TV.
If You want to use a VCR/DVD
Hope this helps and have fun capturing!
-DeXtA