On mobile PCs cooling fan control is pretty limited and on Toshiba notebooks you have one option only. Enter advanced power options for power profile you use and there you will find option cooling methods options.
Set it please to battery optimized and it should reduce cooling fan speed.
Tried that, but I can't seem to find the option in Advanced Power Management in Windows 7 or in Toshiba Assist. Should I try updating the Toshiba Assist? My mom has a Toshiba Satellite and she has access to that option.