i have a problem in my computer .my father attach his office USB to my computer to check some file.his USB contain i think virus .when he open some folders their is NEWFOLDER .EXE name folder.this folder name also get place in my computer and all files and folders contain this file name..my system speed is very low now .its works very slowly.plz tell me how i can remove this virus without formating my hard..if its possible plz tell me