Lock folder in windows XP without any software

How to Do

Create a Folder in   C drive

Consider  "abc" is created folder (without quotes ).

To Lock

Now open Command Prompt from Start Menu(Go Start > Run).
Type "attrib +s +h C:\abc" (without quotes)  and press Enter key.
This command will Make your folder xyz  invisble.It can not be seen even in hidden files and folders.

TO Unlock

To make it visible again
Type "attrib -s -h C:\abc"
Now the folder abc is visible
You can lock any folder

You can lock any other folder also by changing the location C:\abc to address of your folder.