I am running XP home version, SP1. It had been fine until lately, and no new software or hardware has been installed. The problem is that it boots fine the first time of the day, but after the system warms up, it becomes unstable. It takes about 5 minutes, literally (maybe more,) to reboot. When it does finally restart, it sometimes does not start the programs in my startup group, like my virus scan, or weatherbug, and can take a wicked long time to open a wav file. This is driving me nuts, and I figure either the C: drive is starting to die (it is at least 4 years old) or that there is some sort of temperature problem with the motherboard, or even something about the power supply. Maybe someone with more experience can give me a shove in the right direction.