I am not with Laminar Research; just a flight simmer from down under.
Leave your antivirus alone. You will need it for other programs used on your PC. Make sure you are connected to your PC as the administrator when running X-Plane.
Does your PC meet the system requirements found at https://www.x-plane.com/kb/x-plane-11-system-requirements/ Flight simmers usually go for the "recommended" system requirements.
It is well known within the X-Plane flight sim fraternity that AMD CPUs and GPUs do not give the best performance. When Vulkan is introduced into X-Plane (when ?) there should be an improvement for AMD products.
What version of X-Plane are you using? If it is not the genuine, original and official version from Laminar Research then most likely you are using a 3rd party modified hybrid version. If so, you need to read an answer provided at https://questions.x-plane.com/25601/problem-with-737-pfd-after-update-to-11-35
If running the LR version and your system meets the system requirements then you should have a look at the following link found at https://www.youtube.com/watch?v=Tvp8C0rPAuw
If all still proves to be satisfactory then attach your log.txt file so that others with a greater knowledge base than me may be able to provide a solution to your problem.