Television and Home Theater

hello, I read Matt Whitlock's posts on hooking up tv and laptop. But I can not find a good solution for my case. My laptop is vaio PCG-V505DC2 having a VGA output. My TV has only RCA inputs. I used a VGA to RCA video converter to connect my laptop and TV.My A blue screen was shown on TV. The problem is that I can not set TV as the primary moniter, because the box before "use this device as primary moniter" is gray and not checkable.Another problem is that after I checked the box"extend my window desktop onto this moniter" , I clicked "apply" or "OK".

Can anyone tell me why my television picture (Panasonic) is now only in the middle of the screen? Two wide black bands appear on either side of the picture. As far as I know, no settings were changed, however it the problem started when a DVD was played.

Thanks,

Just got an old RCA TV that I cannot change the channel. It has an "Autoprogramming" mode in the set up menu but settles on Ch.91 no matter what I try. No remote, no instructions avaialable from RCA. Can I disable this or does anyone know a method to fix this?