This is what my settings app looks like:
and this is what the beginning of my start menu looks like (all the tiles and app/program shortcuts look normal):
Icons are also missing (replaced with the same empty square box) from context menus, e.g. when right-clicking on the desktop.
I have tried various things to fix it to no avail, including setting up a local user account to test if it was account related (which it is not), and resetting the icon cache (which made no difference).
It happened after "cleaning" the registry using a popular such tool. Apparently not a wise decision and there was no way to restore the registry, not even with a system restore. Apart from this, all other icons work fine. Does anyone know how this can be fixed relatively easily, or do I need to re-install Windows?