I currently have Vista Ultimate installed and I have several problems (too many to list) so I was going to do a fresh install and format the drive. I first tried it with my copy of Vista Business Upgrade Cd, then Vista Ultimate Upgrade CD. When the install starts for either version, it states the the upgrade is disabled and I need to do a custom install. When I choose this and accept the agreement, it goes to blue screen. Windows has detected a problem and has shut down your computer. What is going on?