Hi ramanwalia53, the only way to watch TV on your laptop without having a USB dvb-t dongle, is to goto a website that streams TV channels.
What are you wanting to watch? Search Google for "TV on internet", then check out some of the sites listed. Be aware, this is not strictly legal ( here in the UK anyway ) as even to watch a re-broadcast of a TV signal they want you to have a TV licence!!!
Have a look on Google and see what you find, there are loads of sites which stream t from all over the world.