> I suspect other systems with a calender will also crash. Things like PGM? > > As for why, I'm not sure. Is the date on the PC in question set to something > completely invalid? I've literally never seen this crash before, so something very > screwy has happened on your PC, it could indeed be that you've badly broken your > Windows installation.
Maybe the CMOS battery died or maybe the motherboard BIOS was flashed without resetting to defaults. This could leave things in a wonky state.