Onedrive personal vault problems

I'm having problems with opening my personal vault. The cloud icon at the bottom right of my screen has a red X and all I get is an error saying my personal vault isn't updated. I can't access any of the settings for OneDrive or Personal Vault. I downloaded an update, but when I tried to install it I got an error message saying I was using a newer version and must delete it before continuing. What do I need to do to get my OneDrive and/or Personal Vault working again?