Watching streaming video on my TV

Expanding my desktop onto my TV

Hi, all!

Dell recently upgraded me from the Inspiron 1545 (b/c a salesman tried a bait & switch on me [HIGHLY illegal] to me and then was rude to me in an e-mail about it -- but it's a crappy computer anyway) to a Studio XPS system.

I was told, amongst the many lies they were making up for, that this computer can easily be hooked-up to my t.v. But, so far, no one at Dell can tell me how.

The computer: VGA, HDMI, and Display Port outputs.
Video Card: ATI Mobility Radeon HD 5730

TV: S-Video & RCA inputs

DVD/DVR: S-Video, RCA, Composite Video inputs

I was previously doing S-Video to S-video on my Toshiba Satellite, and had no problem with the video, although most people are pickier than me on this. It was good enough for just watching NetFlix movies or whatever.

Found this item, but but am uncertain if it works on something that is NOT a Playstation (put in a call to the site's help line; am still awaiting word).

Obviously, buying an expensive converter is not really what I'm looking to do.

That's all I got. Ideas would be appreciated. Thank you in advance!