Would there be a reason why a computer would reboot itself?. The system is a Gateway 733Mhz FSB 66Mhz?, 10Gb h/d, 191Mb ram, and win98 se. The system has been completely formatted and win 98 se re-installed, and norton antivirus 2002 installed (with updated def file), but every so often the computer reboots itself, I think it could be because of the 66Mhz FSB, which should be 100Mhz x 7.