I’m looking to use my laptop as a DVR but I know not how. I have a Samsung C630 TV, Asus U52F laptop, and Comcast. By all means I should be able to, the TV even has an available LinkStick.
Have a look at AVerTV USB HD DVR (for US/ANZ)
unless here is inbuitl tool in the laptop you will need TV tuner card/usb TV tuner with capture capability
How to make a Laptop DVR