Connecting Swann Pro-780 (CCTV/BNC) To My PC As WebCam?

Hi,

I purchased the Swann Pro-780 (CCTV/BNC) camera and I've been trying to connect this to my PC this way I can setup recording from my PC but I can't seem to get this to work.

I also purchased the following BNC-to-USB adapter, and I was able to get the video up for a split second but then it freezes.

http://www.ebay.com/itm/4-Channel-BNC-To-USB-DVR-Adapter-For-Security-Video-Surveillance-On-PC-/251520963204?pt=LH_DefaultDomain_0&hash=item3a8fd15284

Has anyone successfully setup a CCTV/BNC camera like Swann to their PC? What kind of hardware configuration did you use?

Thank you!