I went to the control panel and uninstalled the VIRTUALI addon manager from there. I then re downloaded the standalone manager from the website and installed it. Upon startup of FSX, it did not ask me if I wanted to trust/run the VIRTUALI addon manager.
If you are SURE you did this:
reply YES to the question "Do you want to remove the Addon Manager" ?
If you haven't been asked the question to trust it again, it can be only due to one of the following:
1) You have trusted (or UN-trusted) Virtuali by default, so no question will be made again. To fix this, go to the Control Panel, under "Internet Options", look for the "Content" tab, there should be a "Publishers" button, that will list the software publishers that you trusted, and another tab with untrusted publishers. If you see "Virtuali Sagl", remove it from both tabs (especially if it's under untrusted)
OR
2) If you are SURE #1 doesn't apply, then it's your antivirus which is blocking the program from even trying to start. So you must disable the antivirus when installing, and configure it to exclude the whole Flight sim folder before running it.