How do I add password encryption to a file?

I am trying to password protect a few folders on my computer but i don't know exactly how to add a password without a third party encryption software or zipping the file ( i don't want to zip it as i will be editing the file often).

Can someone one please take me through the steps of how to do this!?

info: Running windows 7, word

Question

How do I add password encryption to a file?

I am trying to password protect a few folders on my computer but i don't know exactly how to add a password without a third party encryption software or zipping the file ( i don't want to zip it as i will be editing the file often). 

 Can someone one please take me through the steps of how to do this!? 

 info: Running windows 7, word

e.mccormick · Answer

http://windows.microsoft.com/en-us/windows/encrypt-decrypt-folder-file#1TC=windows-7