Windows 7 never stops running fan, but CPU usage is very low

I recently upgraded my laptop to Windows 7 from XP. On XP, when nothing major was happening, the fan would be idle.

Now, on Windows 7, the computer speed is no different, and in some cases faster. But when I do nothing on the computer, the fan continues running. _However, watching the CPU usage shows that it is less than 5%.

I should also mention that I run Ubuntu 16.04 on my PC in dualboot and it idles the fan whenever nothing happens.

I've been able to use RMClock to reduce my CPU speed. This does reduce the fan volume significantly, but it still does not get as quiet as Ubuntu on the same machine.

What can I do to force Windows 7 to be quiet? I have no problem with further reducing the CPU performance as I'm not running any high-intensity games.

The air coming out of the machine is not very hot.

Specs:

• Toshiba Satellite A70
• 1.5 GB RAM
• Windows 7 SP1
• Pentium 4 538 (Prescott), with EIST (SpeedStep, previous generation) and HT
• latest drivers (which are from XP, BTW)
• ATI Radeon Mobility 9000
• No antivirus running, but I have one installed