can somebuddy lock it ,pls?

hello friends

well, i dont know assembly much
and i m working on my security related project(acedemic)

it needs locking folder and drives
but i didn't get any idea from any other place
but i found am msdn code to lock disk drives

but i think it is telling about locking whole drive,,

so,, can some one know how to code,,

that accept the drive name(c:,d:,..etc) and lock the given drive,
also in same manner to unlock it ,,it asks for drive name.

well, i haven't tested the msdn code(because i dont know asm much) ,but if some guru can plsss,make it possible !!

and ya if there is some method to lock the folder by any other or same method then also pls give me suggestions

here LOCK means not accessible from dos AND windows(98) mode!!

thx for reading my mail,, reply soon pls
$hri