Reinstall Battlenet app.
Do you have an antivirus running in addition to the Windows pre-installed one? This can cause the above error.
Repeated crashes of this VPN app could be causing your issues. This error generally means that there are corrupted app files, settings, registry keys, or insufficient permissions to access any of these.
Also:
- monitor and GPU are set to the same resolution?
- set to high performance instead of balanced or adaptive in the nVidia settings
- check your GPU temp?
- disable full screen optimization on the properties for Overwatch exe and OverwatchLauncher exe
- check this thread about Corsair driver conflicts
- you update your RealTek audio drivers, as lots and lots of people complain about an issue with RealTek and newer Windows builds.