Can old virus chest be deleted, and if yes, how?

Windows 10 pro, 1703, 15063-632.
Just updated my free Avast to 17.7.2314 thru the GUI, everything went well. In the old version I had two files in the virus chest, which could not be deleted by the procedure supplied by Avast; so I thought I let them stay. Now, the new version happily announces that “your virus chest is empty!” - but I still have the C:$AV_ASW$VAULT\vault.db file (315KB). Can I delete it? Should I delete it? if yes, how to give myself permission to do so?
Thanks for the help
Adam Kertesz

Learn how to use Windows and delete it.

Take owneship of the folder, use a live medium, emove the protection first etc.
Take your pick.