A lot of times, BSODs are a memory error (at least in most cases I've dealt with). Are you computer savvy? If you are up to it, you can reseat your RAM (pull it out, put it back it; it could be loose/not secure and causing this).
If you've done that, the next thing to do is check for a failed stick of RAM. You can do this by running memtest86.
You need to burn it to a CD in ISO format using a program like Nero (Burning ROM) or a free program such ImgBurn
(great program!). If you need help doing that, just let us know.
Edit: If you do decide to reseat the RAM, you might as well reseat the video card while you are at it. Like I said, I'm not sure if you built this computer and if you are tech savvy or not...It's not difficult though.
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