Ya got me there, I dunno. I posted a thread on not being able to access Sourcebans a couple weeks ago and noone's bothered to address the issue yet.
Makes it hard to manage your bans, I've been keeping notes on my own computer in the meantime. That's weird that it's showing a virus attacking you though. My software doesnt say that, SB just doesnt come up at all, it goes straight back to the NF website.