When the antivirus is defective, the one and only correct procedure to install is:
- Download and install with the antivirus ENTIRELY DISABLED
- BEFORE starting FSX, configure the antivirus to exclude the following files from scanning:
YourFSXFolder\bglmanx.dll
YourFSXFolder\fsdreamteam\Couatl\couatl.exe
YourFSXFolder it's usually C:\Program Files\Microsoft Games\Microsoft Flight Simulator X, if you installed it in the default folder.
- Be sure you exclude files for the real-time protection, not just for manual scanning (Norton has two separate settings)