The Klez.E worm has been around for a while but you may not have known about it. I’m still receiving this worm in my e-mail and I’ve had folks ask me about it, so I thought it might be fitting to point you to a few resources.
You can read a couple of informative articles at ZDNet and Wired.
You can find instructions for removal of the Klez worm at Symantec’s site
And let me take this opportunity to remind you that you should be using virus protection on your computers and that you should update it regularly. Most anti-virus programs have an auto-update feature which keeps your virus DAT files up-to-date automatically.