Hello Jackie,
press Control+Shift+Escape (Hold down Control and Shift, and press Escape)
to open the Task Manager. A window will pop with a list of processes running
on your laptop. Note the average use of the processor and report it here.
Fan always on usually means that laptops' internal sensors show CPU
temperature too high. This might be caused by high activity of the notebook
(perhaps there is some dead process that's eating all of the CPU).
Hope that helps