Gfinan,
Obviously, you need to do a little research before posting in a harsh maneer about RCU readers. It looks to me like a mailing worm. People get these in their email and if they dont have antivirus software, it attaches to their address book without them even knowing it. Most are a Medium Risk mass-mailing worm. This comes from the Mcafee site
"Sometimes posing as a Microsoft Security Update, this worm is intended to spread via the following methods:
Mailing itself to recipients extracted from the victim's machine. It mails itself from your machine and you dont even know it.
Copying itself over network shares (mapped drives)
Sharing itself over the KaZaa P2P network (Notorious for this)
Sending itself via IRC
The worm terminates processes relevant to various security and anti-virus products. Additionally, the worm contains its own SMTP engine to create outgoing messages to harvested email addresses from the victim's machine.
Various outgoing messages are created, with multiple subject lines and attachment names. Some make use of an Internet Explorer vulnerability to ensure the worm attachment is run upon viewing the email. When the worm is run on the victim's machine, a series of fraudulent message boxes are displayed. The worm installs itself (using a random filename) into %WinDir%, for example: C:\WINDOWS\ZNFUL.EXE."
So you see, someone has a virus and probably doesnt even know it. So its a good thing you have AV software. Consider yourself informed.