D drive not connecting

All of a sudden my D drive is not connecting. It is an integral SD Card which apart from C is by far the most important, holding nearly all my apps and programs, and more . It is my default download location. The desktop icon has a '?' mark but nothing is indicated as wrong in Device Manager, where it is referred to as 'working properly'. It is not shown in MY PC and in a Gadget Drives Meter it is listed but shown as empty with zero usage.

I see there is a lot of advice on this site and elsewhere, but I am not clear what to try next, preferably for me a simple fix. I have tried both restarting and closing down, and refreshing apps which list connected drives such as Drives Manager. Drive Letter View (nirsoft) does not show it. I have removed and reinserted the card (the first time in four years).

I will try 'removing it and reinstalling it in Device Manager. What should I try next?

I also keep getting this when I start up, is it relevant?

I have not tried removing / reinstalling the driver yet --- I am always nervous of doing this in case it breaks something. I have checked my driver manager program and while it shows several drivers are in need of updating they do not seem relevant (eg are for camera, or display, or touch which was updated recently) and I have been following the advice (on this site) "if it ain't broke don't fix it"

Solved. What I did was to remove the Card and put it into an external Card Reader, mainly to see if it could be read without corruption errors. It was OK, I could launch files from it, so I put it back into the Slot ---- and after a restart it has worked fine.