windows 7 64bit If I create autoexec.bat & config.sys in C or D or any USB drive at the at the root directory, then refresh, they will become hidden file automatically. I have to set "show system protect files" to view them again. If I change their name to 123.bat or 456.txt, the hidden attribute is gone. If I create some other files, name them like io.sys, grldr, they will not affect by this weird problem. I tried attrib -S -H then refresh, the files stays hidden. Looks like my system hides autoexec.bat & config.sys automatically if they are created at the root directory. Any ideas?