Are we talking about the NEC Versa P7200?Let me see if I have this straight..........Turns on, just shows a blue screen, then shuts off.That about it?Virus?I would be more inclined to say the laptop is dirty inside.Air is used to cool the hardware components inside a computer.Basic cooling system consists of a Cooling Tube, Heatsink, and Fan Assembly.Cooling Tube:Slightly flattened copper tube, sealed on both ends, and filled with Nitrogen.Has a metal plate, or plates; attached to one end.Heatsink:Small strip of metal that has Tall, Thin, fins protruding from it.This is mounted to the opposite end of the Cooling Tube, from the metal plate/s.Fan Assembly:Small multi-bladed fan sitting in a D-shaped shroud.Let's look at an example, (Not for yours),
http://www.ebay.com.au/itm/NEW-NEC-Versa-S900-Fan-Heatsink-GC054009VH-8-V1-B492-M-/270295120853?pt=US_CPU_Fans_Heatsinks&hash=item3eeed83bd5Two views are shown.The view on the Right is a Top View.Let's refer to it, with references also to the other view. The Bottom view.At the bottom you see a rectangular shaped piece of metal, with 4 holes in it. One in each corner.For this particular model it sits just on the Processor.Heat is absorbed by that metal plate, and the curved copper Cooling Tube absorbs heat from the metal plate.The Cooling Tube then transfers the heat, to the rectangular shaped finned Heatsink.The Heatsink absorbs the heat, then radiates it away with it's Tall, Thin fins.Air flow from the Fan Assembly, helps carry heat away from the fins of the Heatsink.If the fins of the Heatsink are blocked off with 'Gunk', and also the fan blades; the laptop overheats.['Gunk' = Dirt, dust, hair, lint, food crumbs,....you name it ]This is an example of a laptop that is dirty inside,
http://www.youtube.com/watch?v=AkAeE5I5E_AYou can see this model has 3 Cooling Tubes, and metal plates; plus 3 Heatsinks.(0:46)When a Processor overheats it turns off. (BIOS turns it off)This is a fail-safe feature that is built-in.Keeps the Processor from burning up.Also the Thermal Paste dries up from overheating.And Thermal Pad.(A Thermal Pad is a material that is impregnated with Thermal Paste)Thermal Paste is used on top of the Processor, most of the time.Other times a Thermal Pad is used instead.A Thermal Pad is generally used on a graphics chipset.For additional questions please post in a Comment.Regards,joecoolvette