"Microsoft Outlook must be closed because an error occurred. Any unsaved work may be lost."

I then have to quit out of Outlook. I suspect that it has something to do with an email that I deleted named "*** Email address is removed for privacy ***" which I suspected as malware or a virus (the file was never opened), because I have narrowed it down to this file. If I click on it or even select a range of files to delete including this one, the quit window appears and out I go.

I've run a full virus scan before going this.

Is this a problem or should I just ignore it?