Customioze Windows 7 Power Button Action

Step 1: Go to Start Menu -->Right Click Shut Down Button

Step 2: Click on Properties

Step 3: Choose Power Button Action.Here you will find a drop down menu

Step 4: Select Any Action whatever you like and Press Ok.

Following Power Action Options are found in Windows 7:

Switch user
Log off
Lock
Restart
Sleep
Hibernate
Shutdown