I would like to zero-fill my HHD and perform a clean installation of Windows Vista. If I understand correctly since my OS was preinstalled that the system won't allow this simple task, why I don't know? Well, I said I didn't know but I think its because they don't want you to kill Vista. It's a proprietary deal with the movie industries and a few other people which is highly ridiculous. It's like buying an automobile and having someone else tell you when you can drive it. Well whats the use in purchasing a product that you really can't control. Windows Vista is being forced on people and that's something that people don't like. All I wanted to do was zero fill my HHD for performance reasons and then reinstall Vista as much as I hated too, I preferred Windows XP PRO. I really don't hate Vista it's just that I happen to have a great deal of money tied up in software that I can't use. I'm sure Mr. Gates don't or never will have that problem. Since Microsoft forced this product on people why don't they refund all the legitimate hard working folk the monies they've lost in dealing with this mess. Right now the consumers are caught up between the software makers and Windows Vista. This really is a mess.