Hello,
First you can just try to open ASC. Sometimes just that make a difference.
If that does'nt help, then you can check, if the preset are located in your main preset folder located at the resource path set in ASC.
If the presets are present, then you probably have a corrupt database file. Then you can try to delete the db.db3 file in your main preset folder. Then open Analog Lab and let the database rebuild. It can take a little time.
If the presets against exspectation are'nt present, then you can try to uninstall and reinstall the soundbanks.