Well see i have a intel core 2 duo and its running at 45 degrees c and thats at stock clock at 3.006 ghz so i think your good so far but i would recommend getting some new thermal paste like artic silver 5 or if you can aford it try a water cooler
The max temp for the CPU on Intels documents is 69.7. But i dont even believe taht is the max temp for the CPU. But even if it is your temps are fine.
On anotehr matter, if you bought it already overclocked but when you got it it wasn't did you pay more for the overclock???? should you not get the system changed?