For some or most of you who didn't know, I was able to take an eMachines computer that I bought at least 3 years ago and overclock its single-core Celeron D for the first time. I created a widescreen video that explains my case.
http://www.youtube.com/watch?v=DkRVLUudLDo
http://www.youtube.com/watch?v=DkRVLUudLDo
The CPU went as high as 4.37 GHz without liquid nitrogen and without the system crashing.