The following message was received from my ISP. The danger is not over. Please heed warning!

Warning! Email Virus Alert

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There is currently an email worm by the name of Sircam running rampant on the Internet and all computer users should be aware of its presence. Sircam is spread by means of an infected email attachment that may come from someone that is familiar to you. Sircam gets email addresses from the infected machine's address book and harvests email addresses from web pages that they have visited. The worm takes a random file from the infected computer, infects that file, and then attaches that file to the email that it sends. Since the email might come from a friend and the file might appear to be legitimate, a user would be inclined to open the attachment - the exact response the virus programmer was expecting - and unknowingly infect their machine.
Do not open attachments of any email that contains the following text or something similar:

I send you this file in order to have your advice
I hope you can help me with this file that I send
I hope you like the file that I sendo you
This is the file with the information that you ask for
Delete any email that fits this description and empty the trash to avoid accidental restoration and opening of the attachment.