This issue also starts to happen to me today. If I disconnect my 3 monitors and connect them again, it works, don´t ask me why. But If I exit the simulator and try to enter again the error message (0x887a0020) apears again…
After a lot of reading…
I found a solution in another post: delete the nvidia new app (my issues started after I installed it), go to Nvdia website and download the 566.03 version of the driver. Install it using the exe you downloaded and not using the Nvidea GEForce Experience.
After that everithing is working perfectly again for me.