Did you delete the copy of the file from the Applications folder?
its empty ((
strange
Do you have a new folder in the root of your Macintosh HD called "private"?
probably not empty, but not visible...
this happened to me on my first install attempt. i went back to the app store, deleted 'mavericks' from my apps list, then started over....
What's the spec of your Mac?
deleting of the file and even dragging to AppCleaner didn't fix the issue.
what to do?
Backup and do a clean install is what comes to mind...Can't see any other issues unless you have problems with your Apple account.