Even though Black Ops 3 is 6 years old i wanted to try it out again and ran into massive problems and it wouldn’t start and not even in safe mode!
After spending a few hours trying to search for a solution online which i tried them all, i found nothing that worked.
The first thing i tried was to add the games folder to my antivirus exceptions list.
After giving up on ever getting the game to start again i was messing about in Bitdefender thinking there must be some setting that’s causing the problem.
Advanced Threat Detection-Causes the game to not start:
Add an exception in Bitdefender and make sure that “Advanced Threat Detection” is on for the exclusion to “blackops3.exe” as below.