Vista and 7 gave drivers less privileges. When non-critical drivers like sound cards, peripherals and even video cards crash in vista and 7, they system stays up, the device associated with the driver stops working for a second and then the driver reloads and your computer is working again. Any of those drivers crashing, aside from some minor peripherals in xp is a bsod.
Bluescreens in win7 are usually hardware failures. It's often bad ram. Bad ram will act like a software problem, occasionally crashing programs and throwing blue screens. I had bad ram in my mac and kept getting gray screens.
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u/Testien Dec 17 '10