As I've said in my previous message, try to go into the Windows Event Viewer, and see the error details for your FSX.EXE crash, and report back with the details, so we can check what really crashed.
And, check the digital signature of the FSX\bglmanx.dll file. If it's valid, you know you got the right download, if it's not, perhaps the antivirus has corrupted it trying to "heal" it, so you must be sure you have turned it off when downloading and installing.