Create a Shortcut to Lock Your Computer

Leaving your computer in a hurry but you don’t want to log off? You can double-click a shortcut on
your desktop to quickly lock the keyboard and display without using CTRL+ALT+DEL or a screensaver.

To create a shortcut on your desktop to lock your computer:
Right-click the desktop.
Point to New, and then click Shortcut.
The Create Shortcut Wizard opens. In the text box, type the following:
rundll32.exe user32.dll,LockWorkStation

Click Next.
Enter a name for the shortcut. You can call it “Lock Workstation” or choose any name you like.
Click Finish.

You can also change the shortcut’s icon
To change the icon:
Right click the shortcut and then select Properties.
Click the Shortcut tab, and then click the Change Icon button.
In the Look for icons in this file text box, type:
Shell32.dll.
Click OK.
Select one of the icons from the list and then click OK

Note: You can also lock the computer by pressing WinKey + Del