DawnNvidia Geforce GT 540M 2GB

Hi friends ,Since a few months I'm working with FSX after I bought a new PC.Also FSX was needed for the PMDG NGX-series.But when I do a flight with my PMDG NGX in the transition between dawn and day , or day and dusk , I have a lost of textures , vanishing trees , blurry mountains , white spots , etc ,... in my final approach to my destination airport. Also I have black spots for the lights during the landing. Very disturbing after a two hour flight.I have looked around for an solution , but I can't find it. I search after some information on different fora with a search-tool.Please , can someone help me ?Thanks a lot in advance.Kindest regards ,Tom.My specifications :° ASUS Intel Core i7 - 2630 , 2,0 GHz.° 4 GB memory.° Nvidia Geforce GT540M 2GB.° OS Win7 Premium 64.Hi ,Please , can the administrator of this forum remove or close this topic ?I made an awful mistake with the title of this topic.My sincere excuses for this mistake. Sorry !!!Thanks.Kindest regards ,Tom.