Fichiers excel remplaces par un message...

Bonjour,

Voila, j'ai un virus sur ma cle USB, qui cache mes fichiers (exemple j'en ai 2 dans un dossier, alors que dans propriete il m'annonce 4). Lorsque j'ouvre le fichier (1KB), je trouve message suivant:

Sorry I am really sorry. I don't want to do it again. This is my first and may be the last if you agree to help me.
Do you want to get your files back? That is so easy just do this. I want you to write a mail to
Zlovel_4evr@yahoo.com
stating how much I loved her.
You know… I gave her everything I had, my heart my phase…. all what I can and had but she gave me nothing
except pain. Now she leaves me alone and I am felling now empty inside. I can't to live without her. That is why I burnt your files. I know may be this file is vital for you as your mail is for me. Be sure I will give your files back with out any damage. Be sure and trust me.
Take a minute from your busy time and write a nice message to her. Then you will get all your files as befor.
Thank you for your cooperation. And I hope you will give me a pardon for my miss use of knowledge. I did it
because I left with no other option

J'ai deja cherche a afficher les fichiers caches. Mais rien n'y fait, je ne les vois toujours pas...

Quelqu'un a-t-il deja rencontre ce pb? Je ne l'ai trouve sur aucun forum... Merci pour votre aide!
Umoja