What I would do, is a couple things here. One, make sure your Java is up to date. If it's not, it often will make you get that kind of error. Two, if you have toolbars, get RID of them. Toolbars are vulnerable, will often piggyback nasties in to your system, and spoof a site you visited.
Finally, if you're using IE (although I see you're using firefox), ActiveX is an issue. ActiveX has ALWAYS been an issue. It makes it so that Trojans and the like easily find a way in to your system. Again, because people who write this garbage piggyback their malware in to the ActiveX controls, spoofing them.
You also need to be sure that your BROWSERS are up to date. If you don't choose to use FF 4.x, as many people don't, then I'd go to Chrome, Opera, or Safari. Browsers not kept up to date are vulnerable as well.
Rechecked everything, still shows clear on my end. Checked all the paths that could be affected as well. Where were you trying to go in the site?