suppose you people have copied your program  in pendrive  within folder  xyz but it is get virus infected
so how can you extract from it?

(1)it will help at practical exam time
first open your pendrive suppose removable(h:).
(2)the open command prompt window. (cmd)
(3)type  h: (of your pendrive drive ).
(4) then type  attrib -r -s -h  xyz (press enter)
(5)you will find your folder again virus free copy it on desktop.