I just got my new Pc 😀 and i have ati Hd 4850 x2 .. I HAVE 17' INCH LCD monitor with VGA connection , i connect to my TV with the S-vid connector and it goes to dual monitor mod ... how can i make the tv the main Desktop ??!
right click on the desktop -> personalize -> display setting
Then click on the monitor that is representing your screen (you can click on Identify monitor on the upper right corner of that window to identify them).
Then click on "This is my main monitor"