1. Use MOVEONBOOT which you find with google.
2. Boot to a RECOVERY CONSOLE and with a few basic commands, remove the directory. You can read the fine books and web sites on how to use that.
I have severl empty folders in my computer that set idle. I try to remove them with the normal comand "delete through my windows explorer. it kept saying this can't be deleted. it kept saying it can't be accessed. Access is denied. These forlder for some users who shared with me my computer in the past. They are no longer using my computer and it's currently under my user name.