I have a Dell XPS 8700 with a I have an intel® Core™ i7-4790 CPU @ 3.60 ghz. I bought it in January 2015. The fan is running nonstop. I cleaned out the dust and plan to change the thermal paste. I would like to check the CPU's temperature before and after I change the thermal paste, to see if it makes difference. Please recommend a free program without malware and tell me what settings to use to check the temperature. Thank you.