This has happened to my computer a lot this week. Usually I go online and sometimes it will just shut off. Other times it shuts off when i try to open other files such as AIM. When the computer shuts off a blue screen comes up saying that this could be because of my BIOS settings with chaching and shadowing and i don't even really know what those are or how to change them. If anyone could help me with this that would be so awesome and i have windows xp w/ a hewlett packard if someone can. thanks a lot