Password a Folder

Go to start-run and type command, now go to drive were the folder is like d: or e:, i want to lock the folder named "songs" which is in d:

To lock a folder------d:/ren songs Alt454 (Note: here u can use any number but three digits number, holding down the ALT key press the numbers and press enter)

To unlock a folder---d:/ren Alt454 songs and press enter (here u have to type the reverse of above)
       or

Click on Start > Run > Enter "Command" and press Enter button
the Command prompt will be displayed ,

Step to Lock the Folder

c:\>ren path newname ALT197
here path is the location of your folder and newname will include path and new folder name , u can also use the old folder name

Step to Unlock the folder

c:\>ren newname ALT197 anyname
here the newname is the name given at the time of the locking the folder and anyname is the name given now to unlock