ANOTHER INTERNET VIRUS

According to CNET:

Yet another Internet virus pretending to be a patch from Microsoft is spreading quickly on the Internet. Swen (w32.swen@mm, also known as Gibe) uses the subject line to entice Windows users to open the attachment. In some cases, the virus will execute automatically. The virus attempts to kill all antivirus and personal firewall apps running on the infected machine.

Follow the link for information on how it works, how to prevent it from infecting your machine, and how to remove it.