If you want to watch TV shows on your PC, yes you can do it. As referenced by Jolancer, you can buy a PCI TV tuner card. Depending on the quality of the graphics and TV tuner card, it might be worthwhile if you don't have a regular TV to watch.
Also Cheano, I think I speak for our members here in saying that we would appreciate it if you refrain from posting like this in the future. You made 3 posts all within 30 min of each other saying that we don't know our stuff... Whatever man. If i wasn't in a good mood today i would have totally disregarded your ignorant style posting. That style is neither welcomed nor condoned and you certanly won't make any new friends that way.