Like TerryNet said, you'd have to utilize third party software. The most you can do within Windows 7 itself is to right click the file and go to "properties." From there, you can change the security settings on the specific file if you're using a shared computer. It won't necessarily provide your file with password protection, but it can limit who has access to it.
A forum community dedicated to tech experts and enthusiasts. Come join the discussion about articles, computer security, Mac, Microsoft, Linux, hardware, networking, gaming, reviews, accessories, and more!