Dear all,

Thank you all for answering the question. I have solved the problem. We have used a kind of recovery card *.

As a user, i want to say it is a good product for manage and protect computers in computer classrooms.

* Be careful - advertising a certain brand of card can be seen as spamming. Especially since your email address includes the name of the company associated with that card
Spamming will not be tolerated.