Your image show it's samples used in presets and not presets that are missing.
Are you sure you have'nt moved the samples after install? Have you made a computer search for them?
If the samples are on your computer, then you just have to move them to the correct location.
Are you sure the preset you select, when you get the messages about missing samples are Analog Lab factory presets?
In generel it does'nt take long to reinstall.
I would try the reinstall in ASC first.
If that does'nt help, then i would uninstall the application, restart the computer and then install the application again. In this case i think it's plausible you need to do this, in case the samples are'nt on your computer.