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The problem with applications like Folder Lock is that they can lock/hide files/folders just in the current OS (i.e the os in which they are installed) but those files/folders are easily accessible in other OSs that boot from the same pc!!! (for example if I hide my files on Windows 7, someone can easily boot my pc with for example a live version of linux and pickup those files!!!)

Is there any application that can hide/lock files/folders in such a way that it could be opened/showed just in the current OS(and of course with valid credentials)?

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Based on your description, you may want to consider full-disk encryption. TrueCrypt is one of the most popular. –  Synetech Jul 19 '12 at 18:24
    
The first rule of security: if they have physical access to the system, there is no security. Encryption would be your only solution, such as true crypt being suggested below –  Canadian Luke Mar 1 '13 at 11:44

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If you copy the files/folders you want to hide into a TrueCrypt container, then they are really hidden, because they are encrypted. No one will see them (regardless of which OS they boot) without knowing the passphrase of that container.

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I'll second the use of TrueCrypt. I use it for documents that I really want to keep safe. It is also compatible with delta-backup type tools such as RSYNC and CrashPlan. I just create a container file in my Dropbox folder. Only down-side is that, on Windows, you have to be at least a local admin user to use TrueCrypt. –  Julian Knight Jul 19 '12 at 20:17

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