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my friends Computer

If it restarts often, maybe check the air vent to see if its clogged. Overheating due to a blocked vent could be a cause.
 
Most likely are:
- overclocking / overvolting
- bad RAM stick
- heat problems: clogged air filter, clogged/dead fans (case, CPU, PSU), loose CPU heatsink
- dying PSU
- dying motherboard
 
Has any new software or hardware recently been installed?
Have any drivers recently been updated?
Has there recently been a storm with a lightning strike nearby to cause a power surge?
Are the hard drives clicking or making any other noise?

Run memtest to test the memory.

Open the case and vacuum out the dust. Make sure to ground the vacuum nozzle to prevent static charge buildup. This can be accomplished by holding the vacuum nozzle in one hand and touching the metal case with the other hand.

Remove the fan on the heatsink and vacuum the dust from the heatsink.

If the machine is a Dell or other similar manufacturer, there may be a diagnostic utility that can be downloaded to help find the problem.

Check the capacitors on the motherboard to see if any of them appear to be swollen.
 
Usually when it randomly reboots like this and it's been locking up. It's an indication that the micro farad capacitor are either bulging or have completely leaked. If they've already leaked, chances are the system won't throttle at all. So, IMO, check the Caps on the board.
 
I think it's just the common spyware that gets onto a computer and causes those problems. I had the same ones when I had spyware, but ad-aware, spybot, and spy sweeper 4.5 did the trick.
 
This is a million $$$ question with a million causes and fixes! What kind of computer, laptop or desktop? Brand name or self built? When did the problem first showed up? What was the last software you installed? Hardware installed? Software removed? Hardware removed? Did you just accessed the inside? Temps? Have you tried restore? Spywares? Virus? Defrag? Disk Cleanup? etc. . .?
 
Remove the PC card for now. Run the unit and feel for the bottom of the laptop to make sure it is not overheating. Laptop bottoms normally runs warm, which means you won't start to feel the heat until 3~5 seconds after you placed your hand on it. If it's warm that's norm. But if it's hot it could be that the cpu is overheating. To verify this download MBM and monitor the cpu temp. Normal CPU temp should be less than 60C although CPU's are designed to operate as high as 70C. If the CPU is hot you might want to check the cpu hsf. If it's working you should feel hot air blowing out of the vents. No air means HSF is not working. If there is air out of the vent but not hot or very warm, then the hsf may not be installed properly. If the unit is warm and normal, try booting in safe mode and see if it also locks up or re-starts in safe mode. If it doesn't, then the problem could be software or driver related. You might want to check for updated drivers.
 
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