Windows 7

• 1). Click "Start" and "Control Panel."
  
  
• 2). Click "System and Security" and select "Power Options."
  
  
• 3). Select "Change advanced power settings" under the Power Saver section.
  
  
• 4). Click "Processor Power Management."
  
  
• 5). Select "System Cooling Policy." Click "Passive" under the menu to slow the fan down.
  
  
• 6). Click "OK" to save the changes.
  
  

Windows XP and Vista

• 1). Click "Start" and "Control Panel."
  
  
• 2). Click "Performance and Maintenance" and select "Power Options."
  
  
• 3). Select "Power Saver." Locate "CPU Processing Speed" in the next window. Under it is a sliding bar with a marker.
  
  
• 4). Click on the marker and slide it towards the left to slow the fan down.
  
  
• 5). Click "OK" to save the changes.