|"what could be the problem"|
There are several possibilities:
- the HSF is installed correctly. Did you use a thermal pad or paste? If paste, did you apply a single dab about the size of a grain of rice in the center of the CPU? Did you lock it down securely?
- case cooling is non-existent or poorly configured. If the system temp is high, the CPU temp will be high. What is your system temp?
- temps are being inaccurately reported. Are you getting these temp readings from the BIOS or a software program? If it's software, did you at least compare it against the BIOS readings to make sure they're both the same?