If you receive any attachment called Happy 99 DO NOT OPEN IT! Immediately delete it, and then go to your deleted file and permanently get rid of it. Then, notify the person who sent it to you that they are infected with a virus and are infecting everyone they email. Tell them to notify everyone that they have emailed since they themselves received the attachment (apparently you can only "send" the virus once to an email address). then, email NO ONE until it is resolved.