To all, I installed the Vista SP1 which is downloaded to my computer and after that the disk is not bootable. This is the first time it happens. From now on, I have to do an image back up of my disk before I update anything. I have Vista Ultimate. Any body has any idea in how to bring the disk back to the previous version w/o SP1. It keeps going back to the safe mode,... normal boot screen. Seems like a device problem with the SP1. Frank