Just to let anyone know, if you have a computer that keeps blue-screening (especially a Dell) and you have run memory tests such as the built-in tests provided by Dell, and Memtest86, and there are no problems found, you should try the Microsoft Memory test utility.
It found errors that the others did not, and told me which stick was the one causing it. After removing the problem stick of RAM, the computer came back to life.
The tools is available here:
http://oca.microsoft.com/en/windiag.asp
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