Computer users should be cautious when receive any email message especially email with attachment that purportedly sent by “1&1 internet”. The attachments contain a virus, dubbed PC Virus. Such email messages are yet another example of a Trojan horse virus being spread by means of an email attachment. The attachment always has an “.exe” extension that is designed to run upon opening. Once run, the virus can give the hackers access to the compromised system. Just delete the email when you receive it. Not all virus scanners can catch this virus.