My computer acts like its switching off and then goes blank on the screen then no response

Hi I was recently playing a game and all of a sudden my computer keeps acting like its shutting down but then locks up just as its supposed to switch off it goes blank on my screen it has never done it before I have had it for a few years now I have played a few different games online and this has never happened before till recently.
I have used a few anti virus programs to try and find a virus that could be causing it a few were found it said they were malware or Trojans and they got removed. I also tried to check for any other viruses nothing found I even uninstalled some games as well.
problem could my system hardware be failing? any help much appreciated.
I also cleaned it out thinking it was overheating could it be possible that the motherboard or proscessor its overheating and burning out. This has happened 14times now doesnt matter what game i play it keeps doing it I think its done it when i just left it on while i was using intrnet i think my dads tried few things and hasnt worked help!!!!!! plz
Its windows 7
Brand Hewlett Packard Item Weight 10 Kg Product Dimensions 41 x 38.8 cm Item model number LN878EA#ABU Color Black Processor Brand Intel Processor Type Intel Core i5 Processor Speed 2.9 GHz Processor Count 4 RAM Size 4 GB Computer Memory Type DDR3 SDRAM Hard Drive Size 1 TB Graphics Card Description NVIDIA GeForce GT 530 Graphics RAM Type DDR3 SDRAM Graphics Card Ram Size 2 GB Operating System Windows 7 Edition Home Premium Lithium Battery Weight 25 grams
It said it had like 53% or more physical memory being used but I didn't have any applications running at all. What could be the problem.

Samuel32_826,
If you have a virus you can run a system recovery to remove the virus.
The system recovery will remove everything on your computer including the virus and put the system back to day one. Just like when you opened it out of the box.
Here is a link that will walk you through the steps of the recovery.
Let me know how everything goes.

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Not to sound like a jerk but this is my 3rd iPhone and I hit the usual fixes.
And we would know that based on the initial posting based on what?

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The fan is free from dust. I reinstalled Windows
There is a new Battery for 1 year
If the laptop is off, the battery can be charged. The laptop is operating normally on battery.
From the moment that the AC adapter is connected, the computer turns off.
When I use the computer without a battery but with the AC adapter, the computer shuts down. Test with another AC adapter, the computer turns off.
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Dr. Lamp,
Shut down is not always at the same point. In the beginning this happened from time to time and than more frequently. If i start up the computer now with the AC adapter connected than he doesn't start up completely. He shuts down and reboot or blocked.
To answer your question, I am able to enter the BIOS settings.
I bought the Yannec battery here:
I summarize the tests that I did together:
Loading battery when computer is off = yes
Running applications only with battery = yes
With AC adapter connected = computer shut down and reboot
Without battery, only with AC adapter connected = shut down and reboot
With other AC adapter = shut down and reboot
If it is a problem of the motherboard is it not possible that it can be repaired rather than replaced by a new one?
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+Message was edited: link has been removed - commercial+

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Try out the troubleshooting steps in the article to resolve issues with your touchscreen intermittent response.
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http://support.apple.com/kb/ts1827
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My computer acts like its switching off and then goes blank on the screen then no response

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