1. Click Start, then select Settings, then Control Panel. The Control Panel window opens. If you do not see the Power Options or Power Management icon, click view all Control Panel options.
2. Double-click the Power Options or Power Management icon. The Power Options Properties dialog box opens.
3. Click the Intel SpeedStep technology tab.
4. Change any of the following settings:
--To run the processor at full speed regardless of the power source, change the Running on batteries setting to Maximum Performance.
--To run the processor at reduced speed (using less power) regardless of the power source, change the Plugged in setting to Battery Optimized Performance.
--To disable SpeedStep technology control, click Advanced , select the Disable Intel SpeedStep technology control check box, then click OK.
--To remove the SpeedStep icon from the taskbar, click Advanced, select the Remove icon from taskbar check box, then click OK.
5. Click OK.