There are dozens of these little "softwares" out there, most of them free, usually with names like "File Hider" or "Folder Lock." I believe that they work at the Windows kernel level and can even make files and folders invisible in Safe Mode. I'd like to test one or two of these programs out, but I'm afraid that if they are buggy, I might lose access to valuable data or otherwise screw up my operating system. Does anyone have experience these programs? Do they do what they say? And more importantly, are they safe to use?