Turn off laptop's fan in Windows 10
Maybe try this guy in advanced power settings? Windows 10 upgrade defaulted my power settings, and if you're on "high performance" IIRC it will be set to active.
I had the same problem using a Dell Latitude Core i7, after upgrading to Windows 10, the Fan was running continuously in high speed mode, very annoying, I just switched from Balance power option to Power Saver, Problem solved, the fan runs in low speed most of the time and only when processor is pushed to the limit it speeds up for short periods of time.