Generally BSD is due to incompatible components or drivers. As suggested, it could also be a bad ram chip.
Here's some references to BSD issues:
1. Link 1, 2. Link 2, 3. Link 3, 4. Link 4, & finally 5. http://forums.techguy.org/archive/in.../t-401160.html
Google Blue screen of death or bsd & you'll get the picture. 1st step should be to update all your drivers for all parts of your computer.

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