I did SFC recently, everything has been running great since March, I even have Windows Update paused until next month so I cant see it being that either.I've had the missing adrenaline icon as you, but not recently. A quick reinstall brought it back for me. I can't actually recall if it was a bug at one point?
If you roll back, I believe you do need to use the cleanup utility.
I'd try first ensuring windows is up-to-date with updates and patches. Can also do SFC and DISM check. Reboot if issues are found.
I'd then uninstall the software, and remove from device manager and tick the box if it says to also remove drivers. Reboot, then run the latest driver again.
Anyways all running fine again, for now. Will see how it goes for now but the flickering in Second Life is back so I wont be installing these latest drivers again.