folder lock without any software in Windows

If u want to lock folder in xp

just make a folder in any drive

e-g "g:/useful"

useful is a folder name

then go to start > Run and type CMD

then
g:

then type

cacls useful /p everyone:n

for authorization



press Y and enter

then check the folder

the folder is UN-accessible and Un-dleateable

if u want to open the folder again

then again go to start > Run > CMD

type
g:

then type

cacls useful /p everyone:f

the folder is again assessable and dleateable..