what are specs of PC? when was last time you cleaned inside case? (reminds me I need to do that tomorrow). What is ambient temperature where you are?
They seem big to me, should have bigger range between high and low. My quad core is running at low 30c and its slightly faster than yours is showing (3.5ghz). Your motherboard temps look okay, so its just the CPU temp that is high. What cooler are you using?