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.
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.
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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.