Lock Your System On Mouse Click

Try this and create the icon to lock the machine:

1. Right click an empty spot on the desktop, point to New and click Shortcut.

2. In the Create Shortcut dialog box, type the following in the 'Type the location' of the item text box:

"rundll32 user32.dll,LockWorkStation" 

 

remove quotes while typing.

3. Click Next.

4. In "Type a name for this shortcut", type "" (any name as u wish) and Click Finish.