Curious

Is anyone else being redirected to another site when they view their friends page? I keep having to put up with the smiling woman from 'lj-toys.com' for a good ten minutes now. I've gotten out of Firefox, cleared cookies and the internet cache, tried all sorts of other things...there's nothing doing, really.

This might sound like a woefully ignorant question coming from a relatively green Mac user, but it's occurred to me that maybe I should worry about viruses. Can you recommend a good (free) anti-virus program for the Mac?