Invisible taskbar icons and cannot Unpin from taskbar

If you create a new user for test purposes and log in as that user do you see the same thing?

History: (Most posters omit this)

When did this start?

Hello, you haven't said when this started. Therefore:

If this started since you upgraded to 1909, then you can try an in-place upgrade repair install which keeps all progs and data and most settings. Tutorial available if needed.

Remember you start this having logged in as normal, and can do this with a 1909 iso file.

Here's how you secure your PCs state- and should be doing so routinely anyway- so often recommended here.

Use disk imaging routinely. That's a compressed copy of the used part of the partitions or disks you have imaged. You can image all partitions comprising Windows as one choice. Thus you can restore Windows to a previous good state
- if your disk fails
- your Windows becomes corrupt or unbootable
- an upgrade goes badly wrong
- your PC is stolen

and it gives you a full backup.

Do that and update it before any major change - save disk images to external storage.

An in-place upgrade repair install takes you BACK in build number within a major build, corrects services, drivers, some registry keys.

Often used, usually perfectly successful.

No guarantees as to whether it will fix your problem of course.