How do I get rid of the Facebook Chat virus?

[CassidyO]

My brother got a link in his chat from one of his friends saying nice photo then with a link to a blank internet page. So now he is having the same problem on his account. We use the same computer and its happens to me also now, we'll both be sending out a link in the chat to all our online friends. I've changed my password, made a new account and even ran avg with nothing found wrong. I just want this to go away.

[Sarah]

You need to change the password, redo the security questions and everything should be ok.
If not, the virus is on the computer itself. Run a anti virus program at LEAST once a day. If nothing changes, go see a computer expert.