I do have a Virtuali folder in C:/ProgramData but it is empty. Should there be anything in it?
As I've said, the content of this folder ( the airport cache ) will be recreated automatically when the Couatl program starts and, if you have a log, it means it has started. However, the antivirus might have blocked access to that folder too, which will explain why, even if it started, why it couldn't continue.
This, of course, assuming you are getting a new log at each start, which you can check by looking at the time/date of the log or, just remove it, and see if a new one is created again. I'm saying this, to be sure you are not looking at the last log created the last time the program started, to understand if it's still starting now.