Jeff H

No, leave it in the root directory.  When you re-install your add-ons, just pay attention to the target path and point it to your current install.  Most add-ons will point to the default install path of "C:\Program Files\Microsoft Games\Flight Simulator 9", Just remove the "\Program Files\Microsoft Games" part and you should be fine.
Glad you got it working again.
Cheers,
Jeff

Ok great.   Glad you've taken a look at the process.  That will make this easy.  :smile:
 
So first thing is that since you're running a 64 bit operating system, you can skip the first step altogether.  The only thing we need to do is set the correct flag in the program.  Before you do this, make a copy of your FS9.exe file.  I've never had a problem with this, but it's always good practice to make a backup, just in case.

1. Open up CFF Explorer
2. Click on the file menu/open and navigate to your FS9.exe file.
3. In the left pane click on the + sign next to File:FS9.exe
4. Look for the subheading NT Headers/File header and left click on that.
5. In the right pane, on the last row of the table you'll see Characteristics.  In the last column you'll see Click here.  Click there  :smile:
6.About half way down in the popup window look for App can handle >2GB address space.  Click the box next to it so that there is a check mark in the box.  Click OK.
7. Go back to the file menu and click on Save as.  Save the file as FS9.CFF 
Once you're done with that, close out CFF explorer.  Go to your FS9 folder and rename your FS9.exe to FS9.org.  Then rename the file you just saved (FS9.cff) to FS9.exe,  If you're using a shortcut, make sure you create a new one from the new executable file.  Go Fly.
Let me know if that fixes the problem.
Cheers. :smile: