Critical Mass

Try this IObit Unlocker, Solution for "undelete files or folders" Problems on Windows 8, 7, Vista, XP, 10 - IObit

Thanks dalchina and Dennis. I'd somehow switched off blocking updates; it installed an older driver. I rolled back to a newer driver...

It was via Windows updates. I'd checked for updates and windows had reinstalled an old Intel driver for my Intel GPU. I rolled back to...

I'll make an appointment at the optician's tomorrow as I could not see that crucial fact stated in the OP at all. Denis

PROBLEM SOLVED. Thanks everyone. I rolled back the Intel driver that I'd installed yesterday and It solved the problem. Thanks again.

My Settings/System/Display Menu looks like this. Note no Brightness (should be first/top on list) Nvidia control panel looks like...

Does anyone know how to get it back. It disappeared from Taskbar popup and Settings menu after restarting my laptop after lunch...

Give us the ability to switch off Efficiency Mode system wide easily.