Hide/Unhide Files with and without registry

if you know the directory of that file..
then go to that directory through command prompt and then use
attrib -r -s -h foldername-filename

foldername-filename.. wtever is hidden. if a folder is to be unhidden
type its name otherwise name of a hidden file..

if u dont know the name of tht folder or file then after
attrib -r -s -h
press tab key.. it will show u one name; if that is desired then u got
that otherwise keep pressing the tab key.

also if u want to hide
attrib +r +s +h filenameORfoldername

this was without registry
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Hidden
change the value to 1

try playing with that

enjoy