I have just received the following email
Mail server report.
Our firewall determined the e-mails containing worm copies are being sent from your computer.
Nowadays it happens from many computers, because this is a new virus type (Network Worms).
Using the new bug in the Windows, these viruses infect the computer untouchable.
After the penetrating into the computer the virus harvests all the e-mail addresses and sends the copies of itself to these e-mail addresses
Please install updates for worm elimination and your computer restoring.
Customers support service
It included an attachment which is trying to mimic a Microsoft update. Mine was called Update - KB1830-x186.zip containing an exe file.
MS normal have 6 digits in their KB articles. Just don't open it.