Desktop flashing + blue screen

Hello,

My screen (HP pavillion laptop) will start randomly flashing between my desktop and a black screen for 5 seconds or so and sometimes it will stop and all will be well. This time it did that and then a blue screen came up saying that it needed to shut down to prevent further damage and shut off.

My computer was acting up so I've just recently reformatted and installed windows 7. Today is actually the first day I've been using it since. I just want to know if this is something that is expensive to get fixed? (I know nothing about computers and will need to take it somewhere). It's a 4-year old computer and I'd prefer not to invest more than I have to in it... Any advice?
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More about desktop flashing blue screen
  1. What was the BSOD error number ?
    Have you installed all drivers from HP for win7 ?
    Have you installed directx drivers ?
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