Please, do NOT uninstall avast… it will remove all Chest entries and you won’t be able to manage any of them.
Try to repair your installation.
If it fails, copy all the folder (and files inside of it) C:\Program Files\Alwil Software\avast4\DATA\chest to another folder in your computer. Then you can install from the scratch:
- Uninstall avast from Control Panel first.
- Boot.
- Use Avast Uninstall for complete uninstallation.
- Boot.
- Install again the last version.
- Boot.
- Move (overwrite) the Chest folder with the one you’ve saved before.
- Check and post the results.