Create a Shortcut to Lock Your Computer

1. Right click the desktop.

2. Point to New, and then click Shortcut.

3. The Create Shortcut Wizard opens. In the text box, type the following:

     rundll32.exe user32.dll,LockWorkStation  Click Next.

 4. 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 (my personal favorite is the padlock icon in shell32.dll).

To change the icon:

1. Right click the shortcut and then select Properties.

2. Click the Shortcut tab, and then click the Change Icon button.

Lock a Folder in Windows 7 &XP

To Lock a folder in windows XP without any software. Follow the steps Below.

1. Make a Folder in C drive rename it as "abc" without quotes.
2. Now open Command Prompt from Start Menu.
3. Type "attrib +s +h C:\abc" without quotes and press enter.
4. This command will Make your folder invisble and it can not be seen even in hidden files and folders
5. To make it visible again type "attrib -s -h C:\abc"
6. You can lock any other folder also by changing the location C:\abc to address of your folder.