Try using command prompt. It really works well.
Open Command prompt and type in as the following example.
attrib +h c:\autoexec.bat
This command will hide your autoexec.bat file so a standard user browsing your hard disk drive would not be able to see the file.
To make the file unhidden use -h instead of the +h so the line would look like the below example.
attrib -h c:\autoexec.bat