71C is too hot for your CPU. You might have put too much paste on or the heatsink might not be attached properly.
Clean off the old paste with some ArctiClean or Isopropyl Alcohol, then apply a small dot of thermal paste to the middle of the CPU, reattach the heatsink and make sure it's firmly clipped onto the motherboard.
Scroll down to the 'Applying Thermal Paste' section - Thermal Paste and How To Use It
Clean off the old paste with some ArctiClean or Isopropyl Alcohol, then apply a small dot of thermal paste to the middle of the CPU, reattach the heatsink and make sure it's firmly clipped onto the motherboard.
Scroll down to the 'Applying Thermal Paste' section - Thermal Paste and How To Use It