+1 to Ext64. I've not had any trouble with that. My fans will all spin up as the computer boots and loads everything, but they'll all drop to normal idle as soon as I get logged in and loaded. I would just do a real good clean (uninstall, reboot and run driversweeper in safemode, etc.) and then reinstall a clean copy and see how that works. If it doesn't do it, just manually set the fan speed to a reasonable level (~40% is generally pretty quiet and keeps things cool enough.)