I've solved the problem ! It wasn't to do with graphic cards or anything. What it was that when I installed it there was an error it didn't tell me, but nearly half of the scenery files did not get installed. Well, I copied them directly from the disk

. I didn't mention though that thatI only had this problem after I had installed it because of an unrelated issue.
Thanks though anyway for the help guys,
Cheers,
Stevie
