Maybe if we can nail down the exact problem you are having we can try to nail down the cause. I have to say I am skeptical that the installation was done correctly if you can't get the installer com back.
I am a little confused by your first post. Are there channels that NEVER are seen on TV2, but are seen on TV 1? Or are there channels that are SOMETIMES seen on TV 2 that are on TV 1? If channels dissapear, do they dissapear from both TV 1 and TV2?
In addition to that, are you saying there are channels that you have never seen since the installation.
I also need to know how TV 2 is connected, and how far from the satellite box it is. And I really need to know what satellites your receiver says you are receiving.