Anyone a livehealthclub.com spam victim and know how to stop or report it?

I got a e-mail from a contact that I knew indirectly from a mass e-mail list a friends and family. I consulted someone I knew since it seemed they were sending this same message as well. I asked if someone was using their address. Apparently they also seemed to get this message from the same contact. After googling... show more I got a e-mail from a contact that I knew indirectly from a mass e-mail list a friends and family. I consulted someone I knew since it seemed they were sending this same message as well. I asked if someone was using their address. Apparently they also seemed to get this message from the same contact. After googling livehealthclub spam I found out I wasn't the only one.

http://www.sitejabber.com/reviews/www.livehealthclub.com

The first e-mail subject simply says "hi"
But if you don't click on the link a follow up e-mail from the same address says "Did you get my invite?"

It then says:

So and so wants to be your friend.

(FOR EXAMPLE PURPOSES DO NOT CLICK ON THE LINK BELOW THOUGH!!)
To accept this invitation, follow the link below:
http://www.livehealthclub.com/rmdemail.php?a=l&q=n5RgpqZhn5U=

Want to control which emails you receive from LiveHealthClub? Go to:
http://www.livehealthclub.com/rmdemail.php?a=u&q=n5RgpqZhn5U=&u=3sij4Nad19ak1tCR4NeZ4OFw58SY3Nxe0dKdmZ9gp5Fhpp1epptenp1ompVgnp1dnpVdnZ5c2suTmqSU09CR1tlcn5FhmZphmriDmZ5impRknw==

Since it looked like a request from someone close I accepted at first thinking that they were trying to be helpful and send me something health related as did they when they first received the message/invite they got. But when you accept apparently it spams your contact list with the message without your consent making look like you sent the e-mail/invite.

Is this a worm? How do we stop it??
Update: I sweeped my computer and it didn't turn up any viruses. I scanned with spybot search & destroy, Malwarebytes, AVG, and Lavasoft Ad-aware. I unsubscribed and changed my passwords. I haven't heard of any complaints from my contacts about receiving an e-mail from me but I did receive the same message that was... show more I sweeped my computer and it didn't turn up any viruses. I scanned with spybot search & destroy, Malwarebytes, AVG, and Lavasoft Ad-aware. I unsubscribed and changed my passwords. I haven't heard of any complaints from my contacts about receiving an e-mail from me but I did receive the same message that was using a relative's mail address.
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