Their could be various reason behind happening of this..
IS IT A HARDWARE ERROR?
Have you recently added any new hardware to your system? If so, power off the computer, remove them, and then attempt to reboot.
TEST YOUR MEMORY
It could be that you have errors in the memory of your system. The best way to check this is to purchase a windows memory diagnostic program and copy it to CD, Use it to Reboot your system and test the memory. If there are problems with this then you will have to purchase some new memory. But it is feasible that this is causing your blue screen of death problems.
FIX MISSING / CORRUPTED SYSTEM FILES
Missing or corrupt system files will obviously impact on the performance of your Windows operating system and can lead to those blue screen errors. In this case you can perform a repair install and return all Windows system files without having any impact on your settings or user data.
MORE SOFTWARE ERROR SOLUTIONS:
It is possible that your blue screen errors are occurring because incompatible software that starts immediately with Windows, and causes the computer to crash. The solution: Use PCs MSCONFIG utility to edit your startup programs.
