When I installed the 591.44 drivers from Nvidia I noticed the disabling of the tray icon were bugged.
The tray icon came back every time the UAC (User Access Control) were activated. I tried to do a clean install of the drivers with no luck. A week later driver 591.59 were released. Same problem. But I found a fix. Two actually. Registry fixes.
Open Registry Editor (regedit) and go to:
Computer\HKEY_CURRENT_USER\SOFTWARE\NVIDIA Corporation\NvTray
Double-click on "StartOnLogin" and change the value to 0
If it doesn't exist, right-click and select New --> DWORD and name it StartOnLogin
When that's done, go to:
Computer\HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\nvlddmkm
Right click on "nvlddmkm" on the left panel and then create a new Key (ie. folder) named NvTray
Then finally create a DWORD "StartOnLogin" and set the value to 0
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