I need a program to capture webcam video...suggestions?

Ok, I drive truck. You would not believe the stupid crap I see drivers doing on a regular basis, and I want to record it to show the family, along with the stunning sunrise/sunsets, etc I see as well. I tried using a dashcam, but it only saves the last hour or so of files.

I have a netbook in the truck with me, I run Overdrive Media on it to play audio books while I am rolling down the road...So I thought I would add a webcam on the dash and use that as a dashcam. Problem is, I cannot find a program that will work similar to the dashcam.

Here is what I MUST have in a program:

- Must work with a relatively slow computer (Intel ATOM Processor, 2 GB Ram, WIN 7)

- Needs to save files in a reasonably small file size. (I want to record 14 hours at a time.)

- Hotkeys would be very nice, so I can reach over and hit 1 key to start/stop recording.

I would LIKE these features:

- saves video in blocks...5-10-15 minute, I don't care what size, but auto saves every X mins.

- hotkey to save current batch (in case of wreck, etc.)

Thanks!

PS, if someone has a recommendation on a good webcam that will do lowlight, drop that in too!