hi

download and run crap cleaner (now known as ccleaner) from file hippo or similar, ... clean windows tab then analise registry and clean....then tools /startup and see what kicks in when you start your commie...anything that you can do without disable.....(do not disable antivirus or firewall software).....this will clean your system but will not remove spyware/virus/malware etc.....this is just a registry/orphan clean, and is step 1...... i suspect there may be other things causing this but ccleaner is a usefull tool to have and its free!.... if not sure/confident go here for helpfiles

CCleaner - 1. After Installation
 
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it coudl be a few things

faulty memory

faulty hard drive

faulty power supply

overheating cpu usually caused by fan failure due to excessive build up of fluff and dust so the cpu over heats and shuts down the computer.

take the side off and give the fan ontop of the cpu a good clean and watch it to see if its spinining constant or spinning sluggish when powered on.
 
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