Can anyone help me please?

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My computer shuts itself off suddenly when I play certain games and when I watch videos. I do not have a problem with my computer any other time except for those things I mentioned. No, my computer is not overheating when it shuts off during these games or videos and yes I have enough memory to do these things. I have done some research on the net to see what is causing this problem and have established that the problem is simply that I need to update some drivers on my computer. I have also established that I can update these drivers by going into device manager, clicking on the devices that need the drivers updated and then clicking "update drivers" after that. The problem however, is that I don't know which drivers and/or devices need to be updated. lol. The reason I know I need to update some drivers is that I found in my research that other people had the exact same problem as me, their computers shutting down while watching videos and/or playing games. These people had asked how to solve this problem. The answer given to all of these people was to update this or that driver. However, in all of these cases the person had a different type of computer or a different operating system then me or both. When I look on my own computer, for the device or driver that any of those other people were told to update on theirs, I can not find any driver or device by any such name. I need to know, specifically, what the device or driver that I need to update, would be called on my computer because I have no idea what to look for. I hope this makes sense to somebody. Can anyone answer my question? My computer is a Gateway, NV79 laptop and the operating system is Windows 7. Thanks