Kena this super irritating Trojan called Kavo. It will disabled "Show hidden files and folder" option on your computer. No matter how many times you try, the virus will revert back to "Do not show hidden files and folder". My avast anti-virus can't even detect it! Not to mention removing it...
Google until mad and finally found this fast and simple removal tool from this
Website!

Note: You would properly see rubbish characters instead of the chinese characters as shown in the picture.
Don't worry.
Simply click on the top button to remove Kavo Trojan.
=)
According to my research, this Trojan is spread via USB thumbdrive or External Harddisk.
Beware!