Hello. Our Toshiba laptop is shutting down in middle of a session, displays a computer message (but it appears so quickly that I can't tell what it says although it seems to say something to the effect that the computer is shutting down to protect itself) and then reboots itself. Thinking this could be a virus? Any advice would be most appreciated. Thank you!

You can check the event viewer in control panel/admin tools for the error details. If you suspect infection, post in the Hijack This forum as you've done before (links in my signature).

Thank you! I'll post in Hijack This forum.