If you Google the error message verbatim, you will find that this has been an issue with other apps (mainly game launchers from what I can tell, but maybe some others too), going back even several years. The listings are too long to list here but I encourage you to Google it and see if you can see anything that might help.
I know this is not the answer you were looking for, but having been subjected to the same error message in the past, I can understand the frustration you are feeling. If I come across a solution, I will post my findings here. But it appears to be a Windows generated message and not DVDFab or AV utility.
I will also try to use the Microsoft's Sysinternals Procmon utility to see if I come across something. Since this pops up for me from time to time, I am also anxious to find a solution other than the ones I have been using, since none of those methods, although they often work, really point to the cause. I even get this message on another PC I have that is also running the same versions of Windows and DVDFab, but different (older) hardware (One is Core i7 based, and the older is Core2 Quad) . Only common environment to both PCs is Windows 10, AV Utility (F-Secure, which was offered and supplied by my Cable provider),Office Pro 2010 and running same versions of 32 bit and 64 bit DVDFab, but still have that message pop-up from time to time.