First dont uninstall the HDMI just go to device manager and right click it and disable it problem solved.
Now as for what you said for speedfan dont know what you read but speedfan is the best software fan controller there is. The problem people have is they dont know how to use it takes a couple brain cells and a little reading and you will figure it out once you do its the best. But to make it the best you have to learn how to configure it.
Knowledge and know how will set you free grasshopper