If you receive an email from "Hallmark" or any other sort of e-greeting, it's best not to open it! If you download the attachment, your hard drive will be destroyed:
Most Destructive Virus Ever! Beware of hallmark E-card - Namecake
Most Destructive Virus Ever! Beware of hallmark E-card - Namecake
It has been classified by Microsoft as the most destructive virus ever. As yet there is no repair for the virus. It simply destroys the zero sector of the hard disc, where the vital information is kept.