hello and thanks for your reply,ihave the avast:
avast! 4 Home/Pro Edition program: 4.1.418 14.6.2004 in french with key licence free after inscription. when i click on the icon of avast it don’t open for scanning viruses but when i clic on the icon of other application,the message from avast “attention il y’a un virus sur votre ordinateur” with the name of viruse, i clic on repair ,the message is"le chemin specifie est introuvable" then i clic on supprime.i supprime the document and contents.so i ask you for a solution to supprime or delect the viruse without delecting documment very important for me.