What's the main cause?

[euphoriam]

My computer turns on, after a bit of gaming it blue screens, restarts and as it loads into the windows logo, anything usb connected shuts off and computer still runs.

I've already tried doing system restore and it fails within a couple seconds of doing it

 

[Colif]

Can you download and run who crashed - it will give us a glimpse of the errors you getting and might help us solve them

Copy/paste summary in here and I see what I can do