The only secure way to hide your files is through encryption. This way turns your data into an unintelligible mess and it only shows the original data to you after password entered. Containing a built-in way to encrypt files, Windows ties the password to your user account. Therefore you are only one who see the files.
You can see instructions in the “Encrypting Files Using the Encrypting File System” section of this guide (you’ll have to scroll down to the last section to see it). All you need to do is right-click on a file or folder, select Properties, go to Advanced, and check the Encrypt Contents to Secure Data checkbox.
The only disadvantage of this method is the encryption related to your user account by this method. It means if your interfering friend tried to open the files from her Windows account, they wouldn’t open—but if you share an account, or if you leave your computer several minutes while you’re logged in, she could be able to see them just as easily as any other file on the PC. So make sure you lock the computer or log off every time you step away, or that encryption won’t stop anybody.
In case you forgot the password, you can keep on reading to know more about how to recover file password.
Guide: Recover Windows/Office/PDF/Archives Lost Password
Take Password Recovery Professional trial for example. With the trial, you can:
· Create new guest accounts without login and reintallation;
· Recovers Office password containing no more than 3 characters;
· Recovers PDF/RAR/ZIP file password containing no more than 3 characters
Step 1: Download and Install Password Genius Professional on any accessible computer.
Step 2: Select one from three options - Files and Archives, Database and Windows
Recover Passwords for Files and Archives – Password recovery for Word, Excel, PowerPoint, Outlook, RAR, ZIP, PDF
Recover Passwords for Databases – Password recovery for Access database
Remove Windows Administrator and User Passwords – Reset Windows password to be empty
1. Take the third option as example, select "Remove Windows Administrator and User passwords"
2. When Windows Password Recovery appears, click it and begin Windows password reset process.
Step 3: Insert bootable USB device into computer and click "Begin burning" to create a USB password reset disk.
Step 4: Insert bootable USB reset disk into locked computer, and press "F2" or "DEl" to set computer boot from USB drive.
Step 5: When Windows password reset screen appears, just choose "Windows and target user" you want to reset its password. And click on "Reset Password" button and "Yes".
Besides password reset, you could also create new administrator without login with "Add User" option in Windows Password Genius program.
Step 6: Click "Reboot" button and exit USB flash drive to restart computer normally.
Now Windows password has been reset for your locked computer, you can select the user to login computer.