need help capturing tv to my pc for editing

I've got a Hauppauge WinTV HVR-1600 NTSC/ATSC Combo TV Tuner. I've got a lot of Rockets games on my DVR which I'd like to capture to my PC and create certain compilations from, but I need some help on how to do it. Before, I used to be able to just record it to my PC using windows media center, and then import that file to windows movie maker to edit it and publish it. I think that was back when I had Comcast, but since then I've switched over to U-verse and it doesn't seem to work anymore.

Any directions on how to get this to work?