First, let me thank everyone for their advice on getting started with add-ons. I did take the suggestions of Bert Pieke and Anthony31 and download the North American ORBX and the SF260. Both are great except their are several block out grey areas near the airport. 

Before I start describing my problem with FSX, I did try to get help from FSX support. I was unable to present my problem as they only had answers for previous questions (no new ones)

OK, the problem I am having is after I start fsx and chose free flight and then an aircraft, airport, etc and OK everything and then click fly now. I am sitting on a runway looking out the cockpit window and I decide to activate the kneeboard and go to the checklist (actually it doesn't matter what I pick on the kneeboard). Two smaller screens pop up. One is the kneeboard with the checklist on it. The other, which starts half way down the kneeboard, is a screen showing the cockpit view again, but only the left hand side of the original view. Neither of the two new screens is functional. Nothing at all happens if I click on the kneeboard screen. But as I run the cursor over the top frame of the kneeboard where it is superimposed over the menu bar of the full screen cockpit view it will light up the words on the menu bar of the partial cockpit screen. I can change the size of the small cockpit screen somewhat and it will simultaneously change the size of the kneeboard.  I cannot remove either of the two small screens, but I can still fly the aircraft on the big screen. All other functions on the menu bar work perfectly. I have to exit FSX to get rid of the two small screens.For a few seconds after FSX shuts down there is a black square on my computer screen the size of the partial cockpit screen and then it disappears.

Any ideas what wrong and how to fix it?

I tried to replicate your problem and could not. I use the default 737-800 and was situated at KLAX. Everything worked perfectly both in full screen and windowed mode. It could be aircraft dependent (i.e., a commercial payware package you have installed). But, for the default, I did not see the problem. It is possible that you have your fsx settings set too high or you have tweaks in your fsx.cfg that are eating up memory resources and Windows is not catching up with any changes or additions you make to the screen. Same with shutting down. It takes a while for FSX to completely close an object if you are having memory resource problems. Make sure your settings are set to the default (click on the FSX settings>scenery tab and select reset to default). If you have any tweaks in your fsx.cfg, get rid of them by moving your fsx.cfg to a temporary folder and restarting FSX and letting the config rebuild. The more windows you have open in FSX requires more memory resources and you could start seeing problems unless you have a super fast computer. If the problem continues you might want to hit the V key and take a picture of the screen and then post it here.

 

Best regards,