Recently I was having a problem with FS9. I decided to reinstall the program. When I opened FS9, the splashscreen would appear, then the screen would go black and crash to my desktop. FS9 had never had this problem before. I then remembered that I had recently installed IE7 on my computer. Since much FS9's home screen contains bits and pieces of HTML, it will only work with IE6. However, I was not about to uninstall IE7. I did a short internet search and found a solution. If you remove the file oleacc.dll from your main FS9 directory, your problem should be solved.
Although I figured out the answer to my problem myself, I decided to post this in case anyone else has this problem and does not know what to do.
For more info go here: http://forums.simflight.com/viewtopic.php?p=308621&