At approximately 3:39 am Central Time July 11 2007 My computer decided to perform its routine Windows Updating and Upon performing the restart, it began an eternal reboot loop of loading somewhat then poof, reboot again, start over, get to the windows xp loading screen and then poof, reboot again. This persisted for about 10 min before i tried a hard boot thinkin it would clear the memory. Safe Mode will not load, And when i try it gets stuck at somefile called SPTD.sys or something like that. The hard drive light comes on but nothing other than an eternal load to nowhere. Is all this sounding like hardware failure or does it sound more like boot sector virus?