No need of another software to lock folder you want....its easy to lock it from command prompt.
For example: if a folder in D: drive named abc then it will lock by command like this:
open command prompt and follow this-
D:\ren abc (here you have to hold alt key then type some numbers from num. pad of keyboard) then it shows a binary symbol (not like a.b,c,d)then press enter...then check that folder from my computer if not locked try different numbers by holding alt key

Iam born alone in huge sea

is it work in XP ?
if , not so how to lock the folder on dos with XP

i know that its fine in windows but its not working in XP have u check that??

this lock not working in dos plz tell me procedure lock folder through dos