FSX Sky White and ground completely black

Over the past week or so I have noticed that my sky on FSX has gone completely white. I shrugged it off because eI could 'fix it eventually' and for the meantime I could have it on lots of cloud. Only, when I installed "Alfs airfields volume 2" (Rochester Airport, EGTO), I noticed my ground went completely black where there is meant to be grass or outside the airport. I did the usual thing of internet searching it when a website said I had a missing file. I downloaded the file and put it where it' semantic to be and nothing changed. By this time, I had uninstalled "Alfs airfield Vol.2" and still nothing. I have lots of UK2000's products but I have had them ever since I have had my computer. I have un-clicked addon sceanry to see if that did anything, no. Uninstalled the airport, no. I don't have any of the expansion packs installed but have run FSX without them for ages. To try and make it work I installed some ground software that has already been installed by my brother for his simulator and it works perfectly. By the way, at the free flight screen on FSX, where you see the aircraft spinning around, that has gone completely white but the aircraft is still there. Help would be very much apreciated, thanks. David Wood - Flight simulator and Aviation enthusiast.