Thanks for the answer. But I already tried it. I was just wandering why I couldn't see it in command prompt but I could see it in windows explorer(using folder options-windows 7). I think it's a new enhance virus of hiding folders. Before I encountered such virus and I can easily made it visible with such commands as like; DIR /A, attrib, attrib -r -h -s, and the name of the folder is: <DIR> _ when i unhide it. But now using windows explorer the folder has no name or any character. Only a picture that looks like a box. So I don't know if this new hiding folder virus can be cured or be made visible using DOS commands. I hope you can help me. Thanks