Thanks Umberto, but FSX won't start.
In Control Panel, i disinstalled GSX, the Addon Manager and the Couatl script engine.
I reinstalled GSX with antivirus off and then configured the antivirus to exclude bglmanx.dll and couatl.exe.
FSX:in Adminstrator mode without any compatibility
UAC:off
DEP:off
Publisher:digital signatures ok
Bglmanx property:ok
Simconnect diagnostic:no error
If i remove from DLL.XML :
<Launch.Addon>
<Name>Addon Manager</Name>
<Disabled>False</Disabled>
<ManualLoad>False</ManualLoad>
<Path>bglmanx.dll</Path>
</Launch.Addon>
and from XML.EXE :
<Launch.Addon>
<Name>Couatl</Name>
<Disabled>False</Disabled>
<ManualLoad>False</ManualLoad>
<Path>fsdreamteam\couatl\couatl.exe</Path>
</Launch.Addon>
then, FSX start!
I'm starting to go crazy...