When I am in the BIOS my fans run when I am in grub my fans run when I am on ubuntu my fans run but not when I am in windows. Could windows be overriding the BIOS fan control? If so how do I fix it? My hunch is I need to change the HAL from being ACPI pc to APCI uni processor pc. My laptop is an acer aspire 5315 and I installed windows XP on it, it didn't come pre installed.