Hard Drive Encrypting

["Martin Smith" <mart50 () hotmail com>]

     Good Day,

           I have a need to encrypt the hard drive for our laptops running 
XP and 2000 pro. If it can, it needs to be as invisible to the users as 
possible. Plus, it has to be linked to the user’s login and password or the 
users’ cac.

        What tools are out there?


Thanks for your help.

_________________________________________________________________
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