um 64 C is realy hot for a p4 (147 F) it sounds like your system overheated and halted.
i run my p4b 2.53 overclocked to 2.85 and i dont even hit 125F (51C) at a full load.
i would invest in a new heat sink and some good thermal grease. arctic silver is what i prefer, but any good brand will do.
just some more questions for you. when you put the stock heat sink on, did you put thermal grease on it? and if you did how much did you put on. how is the airflow in your case?
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