Sony PCG-NV100 VAIO User Manual page 140

The sound of my computer's fan is too loud.
Use the PowerPanel utility to change the Thermal Control Strategy setting to Quiet. This setting slows down the CPU
speed. See PowerPanel Help for more information.
To reduce fan noise
1.
Right-click the CPU: Performance Profile
Profile Editor window appears.
2.
Double-click System to open the file if it isn't already opened.
3.
Double-click Thermal Control Strategy - Performance, and select Quiet.
4.
Restart your computer.
icon on the taskbar, and select Edit/Create Profiles. The AC Power
Page 140