Windows 7 has an encryption feature that lets you set up a password on your folders and files. This prevents access to a folder or file for anyone who does not have the password. You may find this feature useful if you have several users on a local computer. Even if a user has access to your hard drive, he won't be able to access a password-protected folder without the local encryption password.
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Click the Windows "Start" button and select "Computer." Double-click the drive letter where your folder is located, which is typically the "C" drive. Double-click each directory until you open the directory that contains the folder you want to password-protect.
Right-click the folder you want to password-protect and select "Properties" from the pop-up menu. Click the "General" tab to view the file's information; click the "Advanced" button to view other options, including encryption.
Click the option labeled "Encrypt contents to secure data." Click "OK" to encrypt and password-protect the folder. The password applied to the folder is the password used to access your Windows account. Users must type your username and password before accessing the encrypted folder.
Double-click the file after you encrypt it to ensure that you can open it. To check the security, log out of Windows and log in with a different username. Note that when you double-click the file, a window opens asking for the username and password to access the folder.