First off this is very very very easy. Anyone can do it without any downloads. Any files on your computer you want to hide? Then just follow the steps.
Step 1: Starting Off
First off find the file you want to hide. (Pic 1) OK now right click and scroll down to properties (Pic 2) Now under general at the bottom it should say attributes: and under that click that says "Hidden" (Pics 3)... yeah simple enough