I assume you are in a room that has no cable outlet, right?
If you don't want to go through the trouble, then you can ask the cable provider to install one for you. Here they charge US$10 per extra outlet when they first install the cable for us. If you ask them to come out and do that now, they will probably charge you for the visit too!
If your room is not too far from a room that has outlet, then you can always wire it yourself. First, you want to get a splitter (can be found at Radio Shack). Then, let's say Room A has an outlet, and your computer is in Room B. You will need two extra cable, a short one and a long one (long enough to run from Room A to Room B).
- Connect the short cable from the Room A outlet to the splitter.
- Connect the long cable from the splitter to the tv tuner card in room B
If you want to hide the cable, then there are extra works. I would run it along the wall and door frames. And sometimes drilling holes might shorten the distance.
Hope that helps.