Both source and display must have a Upnp or DLNA.
In your PC, you must install media server software such media player, arcsoft, cyberlink etc..
Your TV will find the media server automatically.

If you are using windows 7, you must share your media library.
in windows 7 media player, you can found stream button, then enable allow devices play and remote control.
if media player found your upnp capable TV, right click on your selected media, and choose play to>your TV.
TV also capable to search Media that you already shared in network library.

Upnp or dlan not just stream to your TV, it also can stream music to your AVR, handphone, digital photo frame etc..
If you have iphone, samsung or nokia n series, you can control your dlna devices.
Use this phone to search movies from your pc and play it on your tv, search a picture from your network storage and display it on your photo frame.

PS: Ade jugak peti ais yg support DLNA ni, untuk apa? I dont Know...

Ooooo... I see

PC is a computer, should be TV near the Computer..

That wold be best option I guess. Media player can lot more than media renderer /receiver(your TV). It can become NAS, media server, media controller, torrent client and lot more.

But if you have a hundred of movies, thousand of musics, million of pictures, PC would be the best to managed it. Acryan and eaget would be good, HDX, popcorn hour and Dune would be great.