I suggested to him the other day that the tower would needed to be opened, then to get a can of air and blow all the accumulated dust off the motherboard,HSF, vents,etc., which he had never done before, so it needs it big time.
It's even worse if the tower is on the ground.

65 processes running on startup in the windows task manager
That's a lot of processes. The harder your CPU works, the hotter it gets, thus the faster the fan spins.

Where is the best place to edit which programs to use at startup only? I went to C:/ >Startup Menu> Programs> Startup, but there is nothing there.
start - run msconfig