Your problem doesn't have anything to do with antivirus, missing libraries or anything like that. From your screenshot, which shows the two add-ons without a name, it looks like your add-on.xml has been corrupted. Have you edited it or used an utility that handles the add-on.xml files ? If yes, remove it from these two folders:
Documents\Prepar3D V4 addons\FsDreamTeam Addon Manager
Documents\Prepar3D V4 addons\FsDreamTeam Exclude
And reinstall GSX. Being sure nothing is touching these files