BTW, if you are still having difficulties capturing, there are two other possible options.
1) My camcorder has a feature named something like "video pass-through" (I'll have to look it up), where I can plug in an analog source to the camcorder, and the camcorder converts the incoming signal to DV video, and transfers it to the computer via firewire in real time. This is handy for when I just want a quick capture and the video I am capturing doesn't have to be of the best quality (HuffyUV versus the DV codec).
[EDIT] The video pass-through function is called "Signal Convert".
The other bonus of this method is that the audio and video are ALWAYS in perfect sync. (Sometimes, I will do two captures. One using this method with audio/video, and one using my video capture card and audio, and then I can compare all 4 tracks in Vegas, using the DV capture as a baseline. Gobs and gobs of hard drive space make this possible
)2) Connect your analog source to the camera, and record directly to tape. Then, plug the camera into the firewire card and capture the DV video from the tape. I mention this because I've had virtually zero problems capturing video from my camcorder into Vegas, and if your camcorder doesn't have the video-pass through feature, then you can use this two-step method to get the same effect.