by Bente Olsen.
I agree with Visvanath, I would always install Moodle manually. You have to do an update afterwards anyway, so there isn't really any benefit not doing it all by yourself, furthermore you know all about your own installation.
Recently I tried to expand a virtual HD, but with no luck. I would have saved a lot of time if I had installed a new VM and migrate the old one to that. So in your case I would do that.