The Security Mentor

It's a malicious program that installs itself when you open an email attachment. It turns off your anti-virus software and on the 3d of every month (starting tomorrow)it scans your computer and attached devices for document files and overwrites them.

So, if it turns off anti-virus software, how do you know whether you've got it? There's a removal tool from Microsoft you can use.

Back up your data anyway, to CD or DVD or to rewritable storage that you then unplug.