Windows Vista and 7

• 1). Hold down the "Ctrl," "Alt" and "Del" keys simultaneously.
  
  
• 2). Choose "Start Task Manager."
  
  
• 3). Click on the "Users" tab.
  
  
• 4). Right-click on the name in the "User" column. Left-click on "Log off."
  
  
• 5). Click on "Log off user."
  
  

Windows XP

• 1). Click on "Start," then "Control Panel."
  
  
• 2). Open "User Accounts."
  
  
• 3). Select "Change the way users log on or off."
  
  
• 4). Click once on the check box next to "Use the Welcome screen," if the box is not already checked.
  
  
• 5). Tick the check box next to "Use Fast User Switching." Click "Apply Options."
  
  
• 6). Close the "User Accounts" box and the "Control Panel."
  
  
• 7). Hold down the "Ctrl," "Alt" and "Del" buttons to open the Task Manager.
  
  
• 8). Click on "Shut Down" in the menu bar.
  
  
• 9). Click on "Switch User."