It may be nothing to do with the temperatures.
When did you last clean away all the crap files? Use click here to do that.
When did you last defrag?
To find out some internal temperatures use click here
When installed look under Computer/Sensor. It will depend on where your PC's sensor are located as to which components will be reported.
Normal running temp? Difficult to say, but anything up to about two and a half times ambient temp should be OK.
You might also want to open the case up and clean away any dirt/fluff which may be clogging up your cooling fans.