|"this does not help me"|
Does that mean you have tried a new monitor?
Another possibility is refresh rate.
If you want to persue the virus angle download the free version of MalwareBytes, Update it and Run it. This often finds and fixes things that AV's miss.
I would try to keep open minded about the situation and don't be rude to people who are trying to help you. The usual result is that everyone backs off.
What's the time?