You probably haven't tried all the remedies. So, let's start from scratch again, please follow every step:
- Go into Control Panel, remove the Addon Manager, if you have an entry for it.
- Go into the FSX folder, verify that ALL bglmanx.dll files AND all the bglmanx*.dat files have been really removed. If not, removed them manually.
- Reboot Windows. Yes, this IS important. Do it, please.
- Turn the Antvirus OFF. Yes, this IS important.
- Reinstall the Addon Manager using the stand-alone installer. Don't run FSX yet.
- Configure the antivirus to ignore the following files:
YourFSXFolder\bglmanx.dll
YourFSXFolder\fsdreamteam\Couatl\couatl.exe
- Open your FSX.CFG file, located at %APPDATA%\Microsoft\FSX, with Notepad.
- Look under the [Trusted] section, and remove ALL the lines that contains a reference to bglmanx.dll. The whole line. Save the file back, don't launch FSX yet.
- Launch FSX. At the request to Trust the Addon Manager, reply YES, to both question, the one by Windows and the one by FSX itself.
- If you get the error the 3rd party module can't be loaded, IGNORE IT, and ALLOW it to run, regardless of what it says. Don't worry if FSX crashes after having issued that message. It doens't matter.
- Keep trying and, allow 20-30 seconds between each tries. If after 3-4 times it's always the same, REBOOT Windows and try again. Yes, this IS important, do it please.