A computer virus, known as the 'love letter bug', is attacking computers across the world. The virus is transmitted in an email with the subject heading 'I Love You'. It comes with an attachment 'Love-Letter-For-You.Txt.Vbs'. Many computers do not to show the extension .vbs, so users see a .txt or text file and assume it is a normal message. The virus is understood to forward itself to every address in the user's address book, as the Melissa virus did last year. The virus also overwrites scripting files with itself and changes the home page on Internet Explorer to go to a website and download another file. The properties of this file are unknown at present. The virus also attacks the graphics format .jpg and audio files mp3 and mp2.