Thanks Jim; After playing around all day i found the problem. It was the video card, i updated it this morning and after looking at event viewer i found the connection with a code that i googled and one fault i read suggested video card. The driver update giving me problems was 361.43 I reinstalled version 359.06 and FSX works. Thanks for the quick responce.
My fsx starts up no problem, however when I choose the free flight option the screen loads but the plane preview is black and after a few seconds it freezes my entire computer, cant even ctrl,alt,dele. I have updated the FSDT manager, and still having same problem. Any thoughts.