The HUBB just kicked off my anti-virus
 

I have just loggoed on and every time I click on a new page my NOD32 anti-virus tells me it has blocked a trojan, do we have a problem?

Sounds like a false positive to me. I've checked with other AV programs and none have an issue, and no one else has reported an issue either. Also checking our server everything looks fine.
I HAVE seen this before, but it's been years - an update to the AV and it went away.