My son's PC, a 3 yr old Dell Dimension with Windows XP (Home Ed.) won't bootup, not even into safe mode! The PC goes through it's initial startup/recognition sequence and then the screen goes blue with a message to the effect: "a serious problem has been detected and Windows has been shutdown in order to prevent damage to the computer". It then goes on to say that it could be due to insufficient disk space (this past April, his 30GB hard drive was only 50% full), or a bad video driver, or improper BIOS settings, etc. It then suggests starting up in safe mode (which I did, but the blue-screen with the same message comes back)! The AntiVirus program (PC-cillin) has not been updated for the past 3-weeks, so I was wondering if this problem could be caused by a virus, and if so, what can I do about it if the system won't startup?