Tv and computers

This depends on some variables - 

For this you need to know, which TV (LCD or otherwise) 

Does your computer have a Video Card which can support the TV's resolution ? 

Do You have a TV card inside your computer? 

If your TV has HDMI port, then you should get the video card (or motherboard) which also has HDMI port in it. Then connect the TV via this port (to transmit sound as well)

The TV card will allow you to capture TV shows from an analog or digital connection through an antenna or transmitter of some sort that may have been given to you.

You connect everything in the right ports, and it should work 

Here are a couple of websites that have TV and movies that you can watch, without hooking up any cables, just watch on your computer. Good Luck>

http://www.hulu.com/browse/alphabetical/tv

http://www.fancast.com/

http://desktopvideo.about.com/od/watchingonlinevideo/Where_to_Watch_Streaming_Video.htm

You can also go to ABC-CBS-FOX-ABC to watch their programs. forgot one>

http://www.livestation.com/

there is no need for a cable to be hooked up to your computer to watch tv programs most are already available online for free just click in the name and see what comes up. i watch sanford and son, on tv channel on the computer all the time and my kids watch the shows they like im old school but no need to hook up a cable card to computer just search for your show and watch it. 

Some product features of Windows 7, such as the ability to watch and record live TV or navigation through the use of "touch," may require advanced or additional hardware .All you need to do is put internal or external TV tuner card your system

You need a TV tuner that supports QAM (most do).
The TV tuner should come with s/w, but if you have Windows Media Center, you don't need anything else.

You need to buy a TV tuner adapter for your computer .

You need a TV tuner (external or internal) on your computer so you can watch cable TV from your PC. You can also record tv shows this way.

y u want to do that just log on to live tv websites and online radio websites ... and you are done . Try out www.youtring.com