VNC/RDP programs - Please Help

Hi guys, I am after a program for Windows XP/Vista that will allow me to use my laptop (Vista Ultimate) to do whatever I want (playing games, music, browse the web, and everything else!) and have another computer (currently XP but can run anything if it will allow me to do what I want) that will be hooked up to my TV and amp.

I want to have my laptop stream audio and video to the other computer that will then play it on the tv/amp.

The solution doesn't have to be one program, but I need to be able to use my laptop like normal (windows remote desktop would work, but it logs me out of my laptop when I connect from the server (the other computer that is connected to the amp)(If anyone knows how to change this in windows remote desktop please tell me how)

I'm not sure where to post this, but thought this might be a good place to start, so If anyone can suggest where else I could post this or some applications that could do what I want (or even just the sound or video component) I would be very grateful, so please let me know!

Thanks heaps
Anthony