1. Encrypting through Office- This is one method of encrypting a file. How you encrypt depends on the version of Office you have. For example, if you have Office 2007, click the Office icon at the top left, mouse over Prepare, then click on Encrypt Document. Create a password and confirm it again to encrypt the file. Next, do a Disk Cleanup to remove temporary versions of encrypted files which aren’t protected.
2. Encrypting using file system- Locate the folder containing the files you want to encrypt. Right click on the folder and click on Properties. Click on Advanced under the General tab.
3. Check boxes- Check the box next to Encrypt contents and secure data. Next, click to apply to the main folder or folder and all subfolders. Check which you would like, then click OK and then click Apply.