Pete Dowson,
Just wanted to thank you for the advice above and in another of your posts. I had the FSX "crashes all the time" problem. The control panel event viewer told me that the problem involved the weather.dll file, but I had no idea how to fix it. Based on what you said, I deleted all the .wx flies in my documents folder, and I also deleted the wxstationlist.bin file. And, voila! FSX is running again. This is certainly not intuitive and I'm totally perplexed as to how you figured this out, but I am very grateful. I'm flying again! Thanks.